protein skimmers

Hello, Does anyone have the original sponge for there Deltec mc500 / mc501 and can they compare it to a sponge of known porosity (pores per inch aka PPI) or measure it with a ruler? I bought a mc500 used without the sponge since it's so easy to diy one and you won't make me pay 15 bucks for...

Okay reefers. We all experience nuisance algae issues in our tanks at some point. We deal with it in many ways, from natural options (fish, snails, hermit crabs, etc.) to manmade pieces of equipment. It is the latter that is the focus of this poll and thread. What do you feel is the best single...