![]() Thanks for the response Other people have been saying I could use both but would it be overkill for a 20g long? I know some people have retrofitted their powerheads with spray bars to distribute and soften the flow. You could always do both and have them work together, but depending on your setup, that might be overkill, especially if you ran powerheads. Sponge filters can also be moved around to create a different flow, or move to a QT tank or used to seed another tank, which UG filters can't do (although you can collect some of the substrate to move over). ![]() I feel like UG filters tuck the mulm away better than a sponge filter, but I'm sure that would depend on your setup and probably your water flow as well. UG filters are really great at filtering waste down into the rocks so you can use the gravel vacuum to clean it up. I never had to "service" it but did replace one of the powerheads (I've had it running for 20 years). The flow is enough that I do have mulm that sits under the grid, but that's just a great spot for BB to grow. I've loved my UG filter and I've only pulled it up once, when I had to reseal my tank. This set up would never work for guppies as the current is too strong. For me the combination was a must because I set up the tank for goldfish and knew I would have lots of waste and needed mega filtration. I have an UG filter with powerheads running on my 46G community tank and also have a HOB filter.
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