Also, I just got my 55, stand, lights, filter for $75 on CL. Had to drive 40 miles each way to get it, but that didn't take much gas, so still only $80-85 total. I guess there's 2 questions that could solve rhom or piranha: is there any hint of color on the belly? and are there small black spots on his sides? You could also google images the phrases "Black Rhom" and "Red belly piranha" and compare.