I agree with raising the pump draw level. The wife's tank only runs kalk as a top up with the aqua lifter pump. It draws 2 inches up from the bottom of the container. Also I don't use the prefilter and never had a problem with clogging.
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tank 1 260 mixed reef, 3 ai hydra , Bubble magus curve 9
tank 2 300 gallon mixed reef. 3 evergrow It5080, skimmer bubble king
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