CoralifeBiocube Filter Cartridge 2 Pack

But I find them over priced and wasteful.I usually just use sponges from fluval in the first chamber and media bags in the second chamer with some floss ontop of the bio balls. I just took a few of them out and put the strainer diverter back on.I just bought these again as I cannot find the right size sponges from fluval and was having surgery so I couldn't be messing around with things.I'll be looking for a better solution now that I'm on the mend.

If you want the protein skimmer in chamber one on your biocube this won't fit.I bought some of these and they are useless and overpriced

Works as intended

Good value

Exactly as shown, very fast delivery!