also my oscar in the 30 gallon seems to be very healthy. i know that fishes will eventually outgrow the aquariums they are in, but it seems to me that if you start with a baby it will only grow so big in one tank, then if you move it into a bigger one it will grow accordingly.
This quote made me throw up in my mouth, lol! If you read what you just wrote out loud, the last 2 bars is extremely cruel. "you start with a baby it will only grow so big in one tank, then if you move it into a bigger one it will grow accordingly". YOU CANT FORCE A FISH TO GROW TO HOWEVER MUCH LIVING SPACE YOU WANT TO GIVE IT! ARE YOU NUTS! Imagine yourself, an infant, put in a room roughly 6.5 square feet. you are given toiletries, a toilet and a sink. The toilet does not flush, it is a bucket changed maybe once or twice bi-weekly. you are forced to stay in this enclosure for your entire life. Will this stop you from growing? Well I would say the lack of space for activity and cramped quarters may physically and mentally stress you out, I'm sure if it's enough pressure on a person like yourself you may grow ACCORDINGLY to the given living space, or the latter happens and you grow into this 6'6 monster who has to hunch over and bend your legs to keep from hitting the walls all the time.
In short, it is animal cruelty to stunt growth. It's stressful to the fish, hampers their life span;which means all kinds of un-natural health problems for them. So please, do not stuff a fish into a tank that it could not move in as an adult, let alone fill up with feces in a matter of days. There are options to re-home such as LFS's or craigslist it, or give it away to someone who can house it. Putting it to sleep would even be less cruel *twirlysmi
Just my 2 cents on your "I'll grow my fish according to my tank" line.