I just ordered a bottle on Friday. I've got a 55 gallon and I was going to start off at 5 ml. I'm currently dosing the tank with that much excel daily and I don't think it's making a major difference so I think I'm safe starting with the metricide in the same amount. I've seen people on here dose in higher amounts. I think I read one guy puts 20ml of metricide in daily. I'll let you know how it goes.
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