Originally Posted by sykes
Goldfish tend to grow according to their environment, the more fish or small aquarium retard their growth (but sometimes U get the odd one). I kept blue tang and they do grow fast, but when I move on from 55g to 168g I lost the fish. So now not sure. But what I do know is the some freshwater fish do not care the size of the aquarium as long as there is foood it will grow eg, african catfish, arowana, giant gourami, snake head and redtail catfish to name a few.
I agree, when I went to a freshwater 90g tropical, a lot of those fish had to be taken to the LFS
as they outgrew the aquarium. My prized fish was a giant red finned gourami, the 3rd to ever be taken into captivity after their recent discovery in the wild... he outgrew my 90g mighty quick, kicking out two Oscars, and green severums, he continued to 15" in a 180g until around 6 weeks ago when I sold him at the LFS
and began transforming my 90g aquarium to SW
, and selling my 180g to raise money for the equipment. I've had FW
catfish outgrow the aquarium, amongst other fish.