Nice tank! I'm jealous. I've been searching craigslist for a 125G at a good price. So far I haven't found anything that includes good lights. Oh well, I'll be patient and keep searching. As long as you're not strapped for cash I'd get some. Just make sure there is room to grow. That is the whole point, it sucks up nutrients as it grows, then you tear off part and it grows again... No other reefers in your area? Not that $15 is a lot of money, but I'd rather buy a frag than spend it on something that should be free