How to Control An Overcrowded Aquarium | Best Guide 2021

How To Control An Overcrowded Aquarium!

The overcrowded aquarium is one of the biggest concerns for anyone starting out in this exciting world. And it is something more than usual, precisely, in these first steps in the world of fish. When we consider the introduction to aquarium hobbies, it is common to ignore some of its fundamental guidelines. A fact that ensures that, when seeing an aquarium of good dimensions, we believe that the more fish the better. Big mistake.
Overcrowded Aquarium

More than solving the consequences of an overcrowded aquarium, the ideal is to avoid that moment. To do this, it is essential to do a little planning exercise prior to starting an aquarium. And not only that. It is also essential to properly inform ourselves about the specific space and water needs of each type of fish

We will take as an example the needs of the guppy: a small fish and very common in aquariums. Despite being tiny, each specimen of this species requires five liters to be able to live properly in an aquarium. Something that gives us an idea of ​​to what extent it is vital to know in depth the fish that we are going to include in our aquarium.

And no, it is useless to make calculations to oximeter if we want to avoid having an overcrowded aquarium. Rather, we will have to pull the calculator so that life in our fish tank keeps the balance it demands.

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What Do You Need To Do If You Have Overcrowded Aquarium

  • Search for a new owner for a few of your fish and securely move them
  • Purchase a larger tank as soon as possible
  • Both of those alternatives will require time, so it’s essential that you do the best things while trying to find a brand-new owner or a larger tank.

Here’s what to do:

If you do not currently have one, get a test package that determines ammonia (such as this one) and one that determines nitrate and nitrite (such as this one). You preferably desire no ammonia, no nitrite, and less than 40ppm nitrate.

Conduct everyday water modifications till your test readings are at these levels. You might require to alter as much as 50% of the water at a time if your readings are really bad. It’s much better to perform regular small changes than one huge modification– do not ever get rid of more than 50% of the water in one go, and NEVER tidy filter sponges, plants, or accessories in faucet water!

Eliminate big accessories from your tank as they are using up important water areas. Simply make certain to monitor your test readings too, as you do not wish to disturb the fragile balance of great germs in your tank.

Usage as much Seachem Prime as you potentially can (according to the directions on the bottle).

Think about moving fish into other tanks if you have them, and even other types of big containers such as plastic storage tubs. Simply make certain they are safe and watertight.

You ought to attempt to prevent overcrowding it when you have a neighborhood tank (a fish tank with numerous fish). , if you put too many fish into a tank you might trigger a lot of issues.

Is Overcrowded Aquarium Bad

Overcrowded Aquarium

You ought to attempt to prevent overcrowding it when you have a neighborhood tank (a fish tank with numerous fish). , if you put too many fish into a tank you might trigger a lot of issues.

Here Is What Can Occur In An Overcrowded Tank:

Ammonia and nitrite spikes. If a tank is overcrowded there will be a lot of ammonia, that the germs can not manage everything, and the ammonia and perhaps nitrite levels will surge and trigger your fish to end up being ill and even pass away.

An unclean tank! With a lot of fish waste in the tank due to the fact that there is a lot of fish, the tank will get unclean much quicker.

Hostility in between fish. If you put too numerous fish in a tank, stress will get high and there will be fish battles!

Development issues. Some fish might not be able to grow to their optimum size if a tank is too crowded. While the body stops growing there is a possibility that the organs in the fish will continue to grow and ultimately it will eliminate the fish, this can be an issue.

Here Is How To Prevent Overcrowding The Tank:

Constantly put your fish into a tank that will be big enough for their complete grown size to prevent development issues, or having to get more tanks as the fish grows.

For extremely little fish you can around 2 to 3 inches you can go by the one inch of fish per gallon guideline. By the one inch of fish per gallon guideline, you would be able to put a foot-long fish in a less than a fifteen-gallon tank.

Sadly there isn’t truly a guideline to go buy (unless all of your fish are really little, 3 inches and under).
Simply err on the side of care, and if you see ammonia spikes, unusually unclean water, and combating, your tank is most likely overcrowded.

Consequences of An Overcrowded Aquarium Tank

Overcrowded Aquarium

Starting from this, it is clear: prevention is better than cure. Not only because having an overcrowded aquarium has the consequences that we will see next. Also because it brings with it, in most of the newcomers, the frustration of seeing how our aquarium does not work normally.

Therefore, it is essential to take your time when including fish in our tank. The best way to correctly calculate the perfect number for our volume of water.

If despite following this recommendation to the letter, we begin to detect any of the problems that we are going to see below, we may find ourselves facing an overcrowded aquarium. Let’s see what those symptoms of this situation are.

1. A change in behavior, one of the key signs of having an overcrowded aquarium

Generally speaking, a good number of fish species are territorial. We are not talking only about the characteristics of the Betta, which is the warrior fish par excellence. Without going to that extreme, the fish that live in an aquarium needs to have their own territory. A necessary space to swim and even eat without being disturbed by anyone else.

If we have an overcrowded aquarium, it is more than likely that we will see symptoms of aggressiveness among our fish. And they will fight, a lot. Not only because of the much-needed hiding places for fish in an aquarium. They will also compete for food since, when threatened, their reaction will be to battle with their peers. Another common symptom is that they overeat because of the fear of running out of food.

In either of the two cases, we have to correct the situation since both options lead to a loss of fish. If they eat excessively, they are not only weakening other companions in the tank. Also, in the medium term, they will be compromising their own health. 

If we detect aggressiveness among our fish, it is essential that we rule out that they are species that cannot coexist with each other. In case there are no problems of coexistence between species, there is only one other option: we are faced with an overcrowded aquarium.

2. Diseases in fish

Another of the problems of an overcrowded aquarium is the poor quality of the water. And, even if we have a powerful aquarium filter or constantly clean it, let’s not get confused. The filters are designed for a certain amount of water and, therefore, fish. A performance that is altered in the case of an overcrowded aquarium that, even with a filter, will have much higher levels of toxins in the water.

The aquarium filter is essential but it does not solve the symptoms of an overcrowded aquarium. 

The more fish we have in our aquarium, the greater the number of waste. And, by not being able to be processed correctly, the water will not be that chemical balance so necessary for the life of the fish. Hence, the overcrowded aquarium causes serious health problems for the liver, kidneys, or heart of the fish. But not only that. Excess toxins also lead to deformities and weakening of the gills, skin, and scales.

3. Algae proliferation, another classic of an overcrowded aquarium

A direct consequence of that excess of toxins that we mentioned in the previous point. An overcrowded aquarium is also invaded by algae. Some that find in this excess waste the ideal breeding ground to proliferate without control.

An algae treatment will solve its proliferation in the overcrowded aquarium. 

A real nuisance that we can try to control through specific products but that, above all, we have to avoid reaching the point of having an overcrowded aquarium.

And now that you know the consequences of an overcrowded aquarium, our advice: let yourself be guided by our professionals when you get started in this world.

The best way to avoid having to solve any of these three scenarios, but also to put your fish in danger.

Reduce Algae in Overcrowded Aquarium


Algae are Tallophite plants as well as like microorganisms, fungus and lichens are defined by the absence of distinction in between origin, stem and also leaves.

They likewise lug chlorophyllin photosynthesis and also like fungi as well as lichens, are the oldest as well as most primitive plants, efficient in reproducing sexually, junctures, and also asexualized, that is, exclusively by splitting or gemmation.

Algae in the fish tanks are developed for most of the factors including the wrong option of lights, ineffective filters, excessive fish visibility in spite of the size of the storage tank, food deposit on the bottom, and also bad maintenance as a whole, yet most importantly the reduced existence of greater plants.

Why, though, having no Nitrates in your tank, do the algae spit out? The solution is to seek biological filtration of water by nitrifying and also denitrifying microorganisms.

When the good microbial task is present, algae do not materialize themselves exceedingly due to the fact that the germs have shuffled the raw material in a continual sequence of chemical exchanges, so that the waste of the fish is looked like from the plants through the continual processing of the Ammonia in nitrogen.

In their long evolutionary background, which lasted billions of years, several types of algae have actually found ways to survive even in undesirable conditions of life, so the duty played by nitrogen in the form of nitrates and also phosphorus in the form of phosphates is very important.

How To Stop Algae Development In My Storage Tank?


Recapitulate every little thing that has actually been described, the policies to avoid the development of algae in the aquarium are:

  • Do not overlap the storage tank, so keep reduced the organic lots.
  • Be really avaricious with food somministration and also make certain it’s all consumed in a couple of mins.
  • Correct lights; (Generally 2 lamps, 1 pink psychostimulant and also 1 with white sunlight or led combinations) work for 8-10 hours constantly.
  • Feed consistently and also in the proper way relying on the plants we have in the aquarium if is necessary to use carbonaceous pellets inside the filters, for the absorption of the excess substances. (Likewise utilize C02 co2 to prefer chlorophyllin photosynthesis).
  • Present a great deal of vegetation as well as plants of rapid as well as slow-moving development. (This placing them in competitors with the algae and it will eliminate the nutrition from the algae).
  • Frequent water modifications, even weekly, 10%– 15% with osmosis water.
  • Introduce in the biosystem several of algae eater fishes or invertebrates like Snail Neritina Pulligera army helmet, Planorbarius, fishes Otocinclus or Siamensis, Shrimps Caridina japonica Amano shrimp.
  • When starting a brand-new aquarium, it is recommended to start with 5/6 hours of light a day, do not give plant foods and C02 for the first week, as a result slowly raise in the complying with weeks.
  • Use of electrolytic decontaminating instruments that inhibit algae formation and suspended algae.

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