Before I put that dead rock in my old tank it got a good thorough acid bath and then cooked & dried before being put in the tank. I seeded the old tank with LR bought from LFS as well as live sand (bagged) and a few scoops from fellow reefers. I dont think the rock is the issue. I let the old tank when I bought the new go a little too long. I believe the issue to be phosphates and silicates. Which I can fix. Problem was I had a bit of HA on a rock that I brought in the new tank that was lodged between some zoos and I thought my CUC would take care of it... but as you can see they didnt lol... easy enough to fix tho...
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