Hi it’s Cynao for sure , you have gotten it from something from another tank ,frag plug . Been a bacteria it’s compeating with the good bacteria . It’s easy one to beat, manually remove as much as you can .Chang /add flow to areas use chemiclean as directed . Make sure you add air to the tank and let your skimmer overflow to make sure all equipment gets the dose of chemiclean. Remove carbon added airation its very important while the Medicean is in use.
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