aqua_chem
Aquarium Advice Addict
One problem I see here is that these problems are often confounded to the point that you can really draw any conclusions. Let's say that you have an oscar in a 30g, which I'm sure we can all agree is inappropriate. If the fish stunts, what caused it? I feel that many aquarists put undue emphasis on tank size and not on other, more difficult to quantify contributors. For instance, I don't see someone that puts an Oscar in a 30g tank providing a nutritious and varied diet, which is in my mind a stronger reason to cause stunting; similarly, tank maintenance is probably not up to snuff either.
For the record, I think that the idea of fish hormones stunting growth is likely bunk.
For the record, I think that the idea of fish hormones stunting growth is likely bunk.