Thanks a lot I haven't planned on putting any more fish for at least a month so I think I'll be safe on that part. As far as the diatoms that's what I figured. I also am not going to run my MH till I get some coral in the tank. D u think I should add macro algae now? My refugium is only sand right now. If so where is the best place to get it? I have seen posts in the past on this site people giving it away maybe ill post I'm looking for some. What do u recommend?