So I had a 72 gal FOWLR for 4 years and 2 weeks ago I upgraded to a 130. I don't have space for 2 tanks so I had to take the old one down and replace it. I washed my old sand, used my old water, my old live rock (about 65lbs) and added 2 more bags of dry sand, 30 more pounds of live rock and then topped it off with new water. My fish had to go right back in to the new tank. Yesterday I noticed diatoms. I put a bag of phosguard in my media chamber (which I always ran in my old tank but wasn't on this one) and was considering doing a water change. I have 2 clowns, a coral beauty a green mandarin, peppermint shrimp, achocolate chip sea star, emerald crabs, blue leg hermits and astrea snails. So far the only casualty has been one emerald crab. Is this just because it's a new tank? Is it trying to cycle again? Should I do a water change or just let it ride?
