Appreciate any help! I am new to saltwater aquariums and clueless. My tank is 6 months old. It is fish only. I have been thinking that this brown growth is diatom since my tank is new. But, I’ve read that diatom goes away in about 3 months. It’s been in my tank for 6 months. Can someone help me confirm what it is and how to get rid of it? I’ve read about Dino’s that look similar. Attached photo is the brown stuff growing on my artificial coral. Cleaning crew crabs have had no impact and snails were eaten by the fish.


