I don't know which forum to put this thread. I been having a lot of issue with my tank for the last 6-8 weeks (corals dying). I did an ICP test and it shows elevated levels of tin, bromine and copper. I cleaned out my sump, checked all pumps and searched my DT for the cause and cannot find any. The only think I changed before I notice the corals weren't doing well was adding T5 to my existing LED and adding this Marco's Dry Rock pedestal (got from BRS). I did noticed this discoloration before but today it seems a lot more pronounced and more wide spread. Do any of you know what this discoloration is? Thanks.
