I have 2 large sponge filters running off airpumps in my 180l 4 foot tank. I have 4 axies in there and they work fine, parameters are fine. I have to clean the tank a bit more as some poop and food can get stuck underneath the sponges, which could affect nitrates if left there, but thats not a problem to me. Every or every other day i just pick the filters up and use a turkey baster to remove anything underneath and do water changes twice a week
When i had an internal filter i was always worried about the current and it was quite noisy. Sponges and airpumps are pretty silent apart from the bubbles on the surface.