hmmm ... similar to how I made mine except for the crushed coral ... was the tank used for anything else prior to making it a reeftank ? ... or maybe there is a contaminant in the sand ? ... process of elimination I guess so starting with the arogrocrete is as good a place to start as any ... good luck with it Ross
Cheers
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Steve
“The most important decision you make is to be in a good mood.”
― Voltaire
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