I want to put a powerhead low in my planted 10 gal tank, for water movement, without sucking all my fish or sand substrate up. I have seen the accuclear and quick filter, but would rather use a ? foam sleave (cover) over the intake. Were do you find them??? I would think I would be looking for some type of prefilter??? I have a few aquatic catalogs, but haven't seen anything that could be used. One other question are all powerheads submergable... I will most likley get the accuclear, but the power sweep looks interesting???