The rock Jason is talking about is from my system I have a 55 gallon sump that is hooked up to a reef flow baracuda the flow in the sump is very strong. Also for water changes once a week the sump gets 100% drained and filled back up in less then 3 minutes. Because of the high flow in my sump there is zero debri in it about 50% off the rock is 3/4 to 100% encrusted in sponge. I totally disagree with getting rid of old rock I actually think a lot of my success with sps is because of all the rock in my system and it's only getting better with age. The pieces I gave Jason were a bunch of smaller pieces as he requested I made sure not to give away my sponge though as he wanted pieces for his display. The rock will not hurt your display and I don't see any reason not to ad a bit more up top. Last month I hooked nick (slyguy00) with 30-40 pounds for his new tank it all went in his display his tank is proof alone that it's healthy he had no algae bloom and only pest he found was one little acro crab zero aptasia! Hope you don't waste such nice rock in your sump Jason By the way thanks for the corals.
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