Idk I keep mine in a 7x18x18 his about 50-60CM (2Ftish) can turn fine, I dont believe his a normally jardini much as he only really swims to kill a goldfish for dinner otherwise he enjoys just sitting there and every now and then will take a nice little swim he can turn around fine also, his been a 6x2x2 and I find he seems to be enjoying the 7X18 much more, id say you would be alright but I think the majority will say no.