Hello, I’ve had my tank up and running since the end of August. Around October I started seeing what I thought was diatoms. They started slow then exploded and covered my rocks and sand. The trochus snails are eating it which is making me believe it’s diatoms but at this point I would think they would be out of silicates to feed on. It’s getting stringy and not really going away. Can anyone help me identify this annoying algae. Nitrates are about 10-15 after just resting and phosphates are undetectable based on the salifert test.