The following is a basic guide to stocking and attempts to answer some of the basic questions that are asked or overlooked most frequently.
There are always posts pertaining to stocking levels in cichlid tanks. While there are no hard and fast rules, there are some considerations that must be taken into account when stocking and aquarium. While not trying to make this overly technical the first thing is to make sure the tank is cycled. I’m not going into how to cycle a tank there is plenty of information on that elsewhere, I will say a cycled tank should have reading of 0 Ammonia, 0 Nitrite, and less than 40ppm nitrate. This would indicate a cycled tank, however the lower you can maintain nitrate levels the better as some species are very sensitive to nitrate and will not fare well in 40ppm. I would shoot to maintain levels below 20ppm maximum if possible or don’t keep species that are particularly nitrate sensitive.
So your tank is cycled, what’s next? Let’s assume this is a fish only (non-planted) tank. Stocking the fish is the next step. A newly cycled tank has developed enough beneficial bacteria to convert the existing ammonia to nitrite and nitrite to much less toxic nitrate in the empty tank. Once fish are introduced the dynamic changes as the fish produce additional ammonia in the form of waste and the Biological filter must be able to keep up with the additional bio-load to maintain the levels mentioned above. This means don’t dump all the fish you wish to keep into the aquarium at once. I would suggest a stocking strategy that introduces the least aggressive fish first. This could be a group of Corys, tetras or the least aggressive cichlid. At any rate allow sufficient time for the fish and tank to re-establish itself before adding additional fish. Test your water and do regular water changes while monitoring the parameters.
A few other things that need to be considered while stocking, is the nature of the specific species being considered. Are they open water species, more of a cryptic type, ambush predators, a combination and last be not least size at adult hood, growth rate compared to tank mates and aggression level at maturity? Some species are much more tolerant of tank mates than others so some research into the requirements of the intended species will prevent much stress on both you and the fish. Conspecific aggression is another important factor, where as two species that inhabit different niches within a habitat may get along fine the same species or similar species competing for the same space may never get along. Male and female aggression is something else to look into before setting up pairs as males may kill females that are not receptive to breeding even if they have gotten along before.
What about tank size? In addition to good water quality the quality of life provided to the fish must be taken into consideration. As an example, an Oscar being housed in a 30 gallon aquarium with daily 100% water changes has great water quality but would it be happy in this enclosure? Some level of common sense has to be your guide when considering species, stocking levels and tank size. A fish must at minimum be able to turn around comfortably in it’s tank or the tank is too small. The rule of thumb is get the biggest tank you can afford keep your stocking levels low and your water quality high. Fish require room to swim, grow interact and escape if and when necessary. Please research any species before acquiring it, your fish keeping experience will be much better for it.
There are always posts pertaining to stocking levels in cichlid tanks. While there are no hard and fast rules, there are some considerations that must be taken into account when stocking and aquarium. While not trying to make this overly technical the first thing is to make sure the tank is cycled. I’m not going into how to cycle a tank there is plenty of information on that elsewhere, I will say a cycled tank should have reading of 0 Ammonia, 0 Nitrite, and less than 40ppm nitrate. This would indicate a cycled tank, however the lower you can maintain nitrate levels the better as some species are very sensitive to nitrate and will not fare well in 40ppm. I would shoot to maintain levels below 20ppm maximum if possible or don’t keep species that are particularly nitrate sensitive.
So your tank is cycled, what’s next? Let’s assume this is a fish only (non-planted) tank. Stocking the fish is the next step. A newly cycled tank has developed enough beneficial bacteria to convert the existing ammonia to nitrite and nitrite to much less toxic nitrate in the empty tank. Once fish are introduced the dynamic changes as the fish produce additional ammonia in the form of waste and the Biological filter must be able to keep up with the additional bio-load to maintain the levels mentioned above. This means don’t dump all the fish you wish to keep into the aquarium at once. I would suggest a stocking strategy that introduces the least aggressive fish first. This could be a group of Corys, tetras or the least aggressive cichlid. At any rate allow sufficient time for the fish and tank to re-establish itself before adding additional fish. Test your water and do regular water changes while monitoring the parameters.
A few other things that need to be considered while stocking, is the nature of the specific species being considered. Are they open water species, more of a cryptic type, ambush predators, a combination and last be not least size at adult hood, growth rate compared to tank mates and aggression level at maturity? Some species are much more tolerant of tank mates than others so some research into the requirements of the intended species will prevent much stress on both you and the fish. Conspecific aggression is another important factor, where as two species that inhabit different niches within a habitat may get along fine the same species or similar species competing for the same space may never get along. Male and female aggression is something else to look into before setting up pairs as males may kill females that are not receptive to breeding even if they have gotten along before.
What about tank size? In addition to good water quality the quality of life provided to the fish must be taken into consideration. As an example, an Oscar being housed in a 30 gallon aquarium with daily 100% water changes has great water quality but would it be happy in this enclosure? Some level of common sense has to be your guide when considering species, stocking levels and tank size. A fish must at minimum be able to turn around comfortably in it’s tank or the tank is too small. The rule of thumb is get the biggest tank you can afford keep your stocking levels low and your water quality high. Fish require room to swim, grow interact and escape if and when necessary. Please research any species before acquiring it, your fish keeping experience will be much better for it.
