Hi they vary in price here in cleveland I paid $14.00but they range between 20 ,35 dollors 3 ,5 inch specimens I say 20 gal tank to 120 if you keep more then one they fight alot but if you break line of sight they will be ok. lot of hiding places - krill clam ghost shrimp small guppies to feed them gut load your fish and shrimp . then feed simple to take care of I have a 100gal with a arrowhead and a congo and a humpback . got them at 1.5 now they are 4 to 5 inches in a little over 18 months. not to many problems now. all is good.