I currently have my 20" pleco in a 75 gallon which is way to small, but it was the widest tank while my 180 was moved. Right now my plans for the 180 is to add the pleco and my 9" featherfin, who get along fine. I was wondering what kind of fish would get along with the pleco. I've had blood parrots with the pleco and featherfin but I was thinking of doing a school of 10 silver dollars or so. It's a sand bottom tank with a some driftwood and there are fake plants in front of my overflows in the back corners.