So I did a post earlier about stocking questions for a 10gal, but I've just moved some things around and now I have an open 20gal hanging around. I'm planning on doing a 25% WC every week to every other week. I'll be having a protein skimmer eventually (don't know what type) without a sump (no space). Is this a good stocking list? If not what would you suggest? I already have the clown goby in my 10gal. Fish: Occelaris clown x1 Yellow clown goby x1 Red/purple firefish x1 Bangaii cardinalfish x1 Green chromis x1 (if I have space for it) Inverts: Blue leg hermits x6 Porcelain crab x1 Tuxedo urchin x1 (I think it will eat the coralline algae, right?) Skunk cleaner shrimp x1 Peppermint shrimp x2 (if I have space and if they'll get along with the skunk and corals) I'm planning on turning it into a reef setup later on down the road. I actually got two zoas on some live rock. [Edit] Also, is it okay to use play sand for a sand bed, or would that cause a diatom explosion from too much silicon? If so, is there something that will readily eat the diatoms?