I have a Marineland 400 and 250 on it. About 130 gallons worth of filtration and then I have a hurricane head that arcs up toward the surface of the water. I do worry about the now 30+ young Black Convicts getting larger and taking over the whole tank. I recently purchased a Filstar xp xl canister filter to make the cleaning a bit easier on me, but it is still in the mail.
This sounds like a recent experience of mine, it took me a period of 3 months to catch 4 cutteri cichlid fry in my 75. I used 3 nets, pulled nearly all the decor, and even resorted to using a minnow trap but it still took forever and now finally they're gone.