Do y’all know what is this brown hair looking algae in my rocks? It’s a bit hard to see, but if you zoom in you can see these brown strands that look like hair , are these hair algae?? They have been annoying some of my coral so what I have been doing is cleaning them with a toothbrush and then siphoning em out, I also have some cuc but they are really eating it. So what is it?

Tank is cycling along nicely and quickly, this is what the parameters look like after 3 days! Tank should be ready for fish by next week!!

I’m in the middle of setting up my first saltwater reef tank, I don’t have water or anything and I’m not done scaping so that’s why there’s so Little Rock, but for a 15g, what snails should I get as a cleanup crew? What type of snails should I get, and how many should I get to keep the tank looking nice?