Are they compatible? I have a 20 gallon high tank with 2 fantail goldfish. I need something that will eat up algae and leftover food. Plecos and most algae eaters are major no nos for goldfish as they kill the goldies.
I have an apple snail with my goldies and they seem to be fine with each other. I also have a 10" common pleco in there with them. If you want to use a pleco just make sure he's fat and happy and you shouldn't have any problems with him sucking the slimecoat off your goldfish.