I have a normal-male and i just recently got a spider-male. And in a lil' while i plan on getting a pastel-female. that being said, my question is... i am just about finished with my 4 tub rack. and was just wondering if it is ok to keep them all in the same rack.( there all going to be just around 5 months old by time i get the pastel). If you could help I would appreciate it. THANK YOU!!!!!!!!!