Slipping a sponge over the intake will drastically decrease the amount of stuff going into the filter, and probably lower the intake suction thus decreasing the likely hood of half the tanks sand getting sucked up. (exaggeration)
I do have a question about this tho for Mgamer20o0, will a sponge for a sponge filter plug into a intake on a power or canister filter, or is the only way to make one DIY?
An example of a sponge filter. Sponge Filter It goes over the intake of this powerhead see that spongy part. You can also just use some pantyhose as well.