sumthin fishy said:To elaborate, goldfish are coldwater fish. If the plecos are the common varriety they will outgrow the tank. I have to assume the 10 fish under 2 inches will get bigger than 2 inches, and could you tell me what kind of catfish? I know this doesnt relate to your origional question, but I see a problem and would like to help before it becomes worse.
The plecos are just some cheap black ones. i have always had gold fish with my tropical. the cat fish is over 5 years old and is about 2 inches (dont know the kind). the other small fish are 4 guppies, 1 molly, 3 zebras, orange sword fish, and there are 3 other small things that are a couple years old and stopped growing