Hi Andy,
I wouldn't worry about the sponge...many of us remove this detritus trapper anyway. If you run the
Bak Pak with the sponge, it needs to be cleaned frequently or it will get stopped up, backing up the outflow from the skimmer. I removed the sponge from my Bak Pak on the 38 FOWLR after this happened.

Any sponge in a tank will need frequent cleaning to avoid buildup of detritus and organics which will break down into Nitrates.
That's one of the things I like about the Remora on the 55....no sponges or other parts to adjust or fiddle with!
HTH,
Dick
