i have a small common pleco. it's the last fish from a large tank of many tropical fish my parents kept. it now is in a maybe 1.5 gallon hexagonal tank. i plan to get some goldfish soon, 4 at the most, and most of which being comets. i also plan to get a new tank for them. i want to know if it would be a good idea to put the gold fish and pleco together or keep them seperate. and also what would be a good size tank to get? i don't particularly want a big tank.