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Just started an aquarium after over 30 years... a lot regarding the hobby has changed since then... Cory has convinced me.. sponge filters are the best filter ever... Aquarium Coop has got me hooked!
I use one of these in a moderately 29 gallon tank with snails, endlers, and threadfin rainbows. This is does exactly what it needs to. Combined with a good pump it has good surface agitation, the fish love poking around it for food, and it keeps my water levels healthy. Also the service at the Co-op is stellar. I would highly recommend it.
I have a 100g tank set up with plants and hungry, dirty goldfish. I have two double stack Hydro-Sponge filters (thanks Cory for the video tip) and two single fine-port sponge filters running on two API-100 pumps. This tank also has a significant pumped filter system, but even so, I do major water changes daily. Long story short, I am setting up a second 180g tank and made a visit to the Aquarium Coop store where I found it essential to take home an additional 11 small Sarassa Comet goldfish to be added to the 180g when it is ready. I was keeping the new 11 fish in an outside tank with plants to go into the 180g. Install of the 180g was unexpectedly delayed, and we had really cold weather, so I had to add the additional 11 fish to my 100g tank making for a total of 25 Comet and Common goldfish with most in the 4 to 5 in. size and one Pleco. Huge overload!! Then, I decided it would be wise to do a med treatment because the 11 did not look so hot at this point. This requires turning off the biological filter system.
My 100g tank has run for 48 hours with ONLY the air sponge filtration and it is still in the Ammonia Safe zone! Absolute proof that by following Cory's tips and suggestions, you can overcome unexpected problems and get away with what should have been a disaster. Fish look great. Sponge filters are literally a (fish) life saver.
When I first put in I didn't think it was doing anything, but after just one feeding you can see that it's at work. I do recommend using a properly sized air pump. Maybe the crew at Aquarium Coop could post recommended match-ups on the website (hint hint). Definitely going to buy some more!