both when i ran my 33 sumpless and in my newer system if i stired up to much crap i just put foam over the powerhead intakes. I would take the foam from an AC HOB filter and cut a slit in it so it fits over the strainer part that comes with most powerheads, when it looked full<dirty> jsut pop it off, wash it and put it back on. I also ran the AC300 with just carbon on or with an attempt at a fuge for a while, but would slip the foam on the intake for it when nessisary.
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