check out the bulk reef supply pukani dry rock. got 30 pounds a month or two ago. it`s awesome. very very light weight & very nice shapes. if you already have some good liverock to seed it . i think you could buy half of what you would need of figi or marshall & stiill have the same coverage. if you buy over 50 pounds shipping is free. shipping is not bad anyway because it ships ups ground. i have bought liverock from lfstores & several online vendors, this has the best shapes, holes & is very porus more then any i have bought before