I'll be setting up an eheim 2213 this week with glass intake with skimmer, and glass lily pipe. This will be the first time I have a canister and right now I have a tidal 35 modified with a sponge on the intake and in the skimmer area. Is it ok for the eheim filter if I put a sponge on the intake? If that's ok, what will it do to the skimmer?