Propylparaben is suspected to contribute to coral bleaching, based on experimental evidence of bleaching in other organisms.I’ve used this in the past to test flow patterns but that was a test tank and wasn’t concern if it was toxic to corals. Didn’t expect it being toxic to fish since it’s not supposedly toxic to humans. Thoughts on using it in a tank with corals? Easily removed with GAC as far as the coloring.
Below are the ingredients from McCormick my wife has and clueless I’m using.