I have 115 lbs in my tank right now and no problems yet. If anything it is much more solid then live rock so it displaces a lot of water which means a smaller amount of water but no complaints on my end. After it grows coraline algae you won't be able to tell the difference. Just make sure you rinse it really well and try to buy clean rock that isn't 'dirty' looking. I bought it for $0.48/lb so about $50.00 for 115 lbs. I think its a good option if you don't want to spend $5 or $10/lb on base rock.
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