Well we used to keep the stock breeder tanks going with very small internal power filters ,they were just sponges ,once seeded washed out once a week in the old tank water I took out . Every monday for the stock tanks took about a third . They were for the most part 2foot long about a foot deep and the same back to front.
They housed corys ,pandas ,barbatus, palys ,pink pigs , about 20 per tank.
Filters used I seem to remember were Fluvals ,there were Fluval 2s and for the bigger breeder tanks 3s . Fed live Tubifex,and Prima, whiteworm some fresh hatched Brine shrimp.
You should be OK as long as you get that filter seeded before you stock too heavy ,or much at all...plus water changes.