flojo
Reefing newb
That's pretty impressive to have a built in right away. Did you just have the spare room available? That's awesome. Looks good so far.
I agree with Yote on the caulerpa. It's a type of macroalgae that you don't want in your display tank. Peel it off.
I was thinking black powder gasoline mix...but then again I was just watching Mythbusters.