Too true. The finer the mesh, the faster it clogs up. Which is why I used to not bother trying too hard to keep shrimp out of that one filter they kept getting into. Never had it happen in other tanks, though I had a couple of CPD and kuhli loaches get into an AC 70... fortunately they don't get chewed up, as they are too big to fit into the impeller well. Baby shrimp otoh, do fit into impeller wells. But in the AC at least, they seem to bypass the impeller quite successfully due to the overall design of the filter. Never found a chopped up anything in an AC filter, thankfully so.