cycling

cycling my tank and saw these appear. Can anyone identify them? Doesn’t look like algae because it has a base connected to the rock. Is this a good thing or bad thing? Haha

So I'm changing from a 30 gallon to a 90 gallon. I'm starting the new tank with all new (dry) rock, new live sand. My question is can I cure the rock in the tank as I cycle the new tank? I will be seeding with some sand and a small rock from my 30 gallon. The reason I'm only "seeding" with a...

Hi all, I have a 125 Gallon Saltwater tank that is about to complete its cycle. I am trying to figure out how much water I should change out when Nitrites are at Zero