Nice post CCC! I really think this one explains it really well.
"Fish growth and tank size
I need to solve a question that has been coming up a lot lately on many of the fish forums. Do fish only grow to the size of the aquarium they are in? I think this is an idiotic statement, but I've been an idiot before when it comes to this hobby. If fish only grow to the size of tank they are kept in, why did I have to upgrade from a 75g to a 125g tank when my Koran angel outgrew the original tank? I didn't see any indication that he was going to stop growing anytime soon.
Thanks and great job on this web sight. I've been coming here for 2 years and it only gets better!!
<Susan, the idea that fish will only grow to the size of their aquarium is an old one, but is only slightly true. Freshwater fish are fairly easy to stunt and usually do not outgrow their tanks. They just usually die prematurely from health complications from poor water quality in cramped quarters or they just jump out and die on your rug. Saltwater fish do not stunt well and again succumb to the health issues relating to water quality or jump. In general, if you want a healthy, happy pet, provide it with plenty of room, good overall water quality, and a varied diet, and you will be rewarded with a long-lived friend.