Welcome to 3reef!
Ft. Lauderdale huh?? I may have to trade ya piece of my toadstool the next time I'm down that way! I finally got coralline to grow, but, merely by accident LOL I tried and tried for years now with a fowlr tank and well, I about o.d.'d my tank on Mg and got some scrapings from another 3reefer and I have little dots of it all over the place and one patch on the glass! Wooo Hooo! But, don't do it like I did. I doubt I'll ever have to buy Mg again. I bought it in bulk and added way too much....did lots of water changes and now it's back to normal with no harm done.