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Looks to be a bacterial bloom. Was the rocks cured?
The rocks are rocks I have used for years over many tank transfers. This issue has been going on for a very long time. Do you think the buildup of organics and the sulfur smell in the sump was fueling this?
Quite possible. Transferring rock from a old system to a new system may have released organic compounds into the water column. This may have fueled a bacterial bloom.