Would this work? My oscars are about 3 inches long and my pleco is about 5 inces long. They are in a 120 gallon tank. I tried adding silver dollars with my oscars and it didnt work very well. One of my oscars tried to eat him...he got out of my oscars mouth but died the next day. Just wondering because I like pictus cats. I already have one in my 55 gallon tank....Thanks for any advice!!!