BIO BAIL!!!!....LOL, that was eating at me that I couldn't figure out the name but then it hit me. That LR rubble idea, with the sponge is a good idea to utilize that space better. I'm not big on bio balls but thats just my opinion, each to his own. Looks like im off to get some rubble and some sponges, great idea, Thanks! Oh and when I said I use hot water....I was just refering to the collection cups, not anything else, those have no biological purpose, just to hold the crap that....well you know, comes out of a protein skimmer. I wonder if I put a little lite on it if i could use a little cheato on top of the rubble, and make a TINY fuge out of it....lol, i'm thinking it would out grow it too quickly and be more of a hassle then what its worth. I dunno has anyone done this with this skimmer before or have any thoughts?