get lace rock, or base rock...its WAY CHEAPER at 2.99 per pound u cant beat that..and it will be living in no time, plus u can still buy sum pieces of the premium nice lookin stuff, like fiji, or tonga, etc... find a snail the has sum coraline growing on its shell, scrape sum of it off next to thew intake of a powerhead, n ur good to go purple, as long as u got good lights, which im assuming u do...