been getting bored staring at my 125 with my rhom in it and all the wasted space, so ive put him back in to a 55. my question is: is it just a matter of his length and being able to turn around when i should put him in a bigger tank? cause he doesnt swim around much and he is only 7" while the tank has a 13" footprint, so i know i have plenty of time till he cant turn. so why else should he have so much room?