I dont know about a pair in a 10,I would say no way.Ive held a few,they can be very fast,if you live in a cooler climate then you wont have temp troubles.In my town its hard to keep temps low in summer.I too love them,but they are no leo and you want everything just right.Good water quality,lots of tall and low hides.I also hear very often that they stress from too much handeling but its hear say.Check their diet,and I want to say they get larger than you may think.Just do lots of research first.I know the temps kept me from getting them but I thought their was something else too,cant remember.