I have a clown knife nearly 16 inches long in my 55 gallon tank i want a bigger tank, im a little low on cash right now. He moves around and swims fine in there,but somebody told me that if i keep him in there much longer when i build my 500 gallon living room addition and put him in there he wont grow to his full potential.I am a little skeptical about believing him so what do you guys think