Hey dude... i think that you and I are on the same thought waves..... I have my baby in a 55 gallon tank..... I had it in the 10 gallon tank (like the caresheets say) and he had no room to roam once it became night time.... I felt so bad to have him cramped up in that little tank... Now he is in the 55 gallon and loves having the room to move about at night. And I am more compfortable that he is growing and building muscles from actually being able to move around. My boyfriend has a three yr old female that does not move around very much (went by the care sheets) and her muscles are actually pretty weak from never working or building them.