I am currently housing two convict cichlids in a 29 gallon tank & can sell the fry to a pet shop owner for .50 per fish when they get a little bigger, but I recently learned that I could earn a little spending money by buying baby RBs from him & then reselling them back to him when they get larger. He says there's a big demand for larger pirahnas which are big enough to feed on live foods. I am going to be getting either a 38 gallon bowfront or a 45 gallon long in a couple weeks. It's all the larger I have rooom for. How many could I have in these tanks & to what size? I was thinking maybe keeping them up to about 2 1/2 inches or so. At what size do they start to become a biting hazard insofar as biting a person's fingers or what not. I wouldn't want serious chompers in there when I'm doing aquarium maintainence. I know ther're pretty much a wuss at 1 inch. I had some before & they were getting picked off by "Fred"...my electric blue lobster. He's quite the little fisherman, but now I've got him in with African cichlids, He does well, but fisherman.......ah!.....not so much anymore!