It's pretty easy to keep my sandbed white, I just take my kent pro-scraper and stir the sand a bit. My rock is another story, super green. Parameters holding strong at: Nitrates: 5-10ppm Phosphates: 4ppb CUC: 10 ORA Trochus 10 ORA tiny cerith 4 Nassarius (the larger super tonga ones, not the little vibex) The nassarius do bury in the sand, but unless I have a huge amount, they're really not going to stir the sand much. The cerith are so small, and only come out at night. I feel like I'd need 100+ to do anything, so probably not going to get anymore. The trochus do a pretty good job, but not sure if I should get a whole bunch more, there's already quite a few of them in the tank of this size. I have a feeling that pods are good for my tank, so I don't want an animal that will stir the sand, but actually deplete my pod population. I was thinking of maybe 1 Zebra Turbo for the rocks, and maybe a fighting conch for the sand (though will that deplete my copepods?).