I've been thinking of doing the same thing after seeing a thread about using pop bottles for it.
I already have a sponge filter on it but I'd like some bio-pellets involved. I was thinking a piece of PVC pipe of appropriate width, cover it in silicone and roll it in some tank safe fossils (I have a bunch of little ones from a nearby site) and basically build a mini filter inside of it w/ sponge and bio-pellet. The added length for sure helps suck up poop on the bottom, but drilling some holes near the top might help get anything kicked up too high
Nice to hear that it works well for you! Good idea
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