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Hello folks, I have been trying to figure out what this is for a while with no real luck. It showed up a few months back and seem to be spreading. I had more on the rocks a month ago before I started replacing some of the rock. I am concerned because it seems to be spreading and the corals are...

Greetings Bay Area Reefers. My name is Joel and while signed up on these forums a year ago I never posted or commented so here goes. Last March I got back into the hobby last year after almost 2 decades. I had fish since I was a kid from goldfish in a bowl up to 150 gallons I always had some...