Sitting rocks in sun for a week or so is more than enough. I took some rock out w/ hydroids and VS, sat on the porch for a few weeks, then into QT tank. Haven't seen one since. Hydroids came back on other rocks in the display so now I am completely restarting.
Don't mind so much about the restart since I can go bare bottom but losing 2 yrs of maturity sucks--for me and the mandarins.
Going to fill the tank with fresh water and run for a day or two to get any VS in the overflow/lines/walls.
Interestingly, I don't have one VS in the sump so I was able to move those sponge covered rocks into the QT tank with the mandarins. Still no sign of them on those rocks.
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Back after a 13yr hiatus--much to my wife's dismay. Though she sure loves looking at the tank and feeding the fish!
Current Tank Info: Reefer 450 seed tank for the retirement 315gal Reef Savvy build.
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