are there any SA's that will inhabit the mid level, be 4-6 inches, and be peaceful enough to not chow down on cardinal and rathburn tetra's, corys and plecos? Basicly, I am looking for alternatives to the standard angel as a centerpiece fish in a planted 55g SA community tank. I have a feeling anything in the 6 inch range though will have a risk of seeing a tetra as a meal but thought I'd see what alternatives there might be besides the usual angels, rams, apistos etc.