I found this growing in my tank... I think it’s algae, but I’m not completely sure. I just set up my tank a few days ago and I have driftwood, rock, substrate, and a couple of plants so far. I have only noticed it on the pieces of driftwood. I am planning on adding fish this weekend. I have had a filter and heater running since I’ve set it up. I have the light on for about 12 hours a day (or a little more), which I now realize is too long. Maybe this is the cause for whatever this is that is now growing in my tank. This is a picture I took earlier, any help is appreciated.