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The carbon dose amount is listed at 3%. I put 12.5 ml in my reefer 525 (approx 125 gallons after rock displacement and whatnot). That means twice a week I would be putting in 1/3 ml of carbon source, or a few drops. I really don't think that has an effect. It would be easy for people to overdose though. Unless you have a huge tank the little measuring cups are a bit big.The product does contain an organic carbon source. Ie strait bacteria food. So like vodka and vinegar use in carbon dosing , it is not an unusual reaction to see initially. Also later as the algae dies then you may see it due to elevated level of nutints and trace ammoina released as the break down in the system.
So yes. Using a bit too much is going to give you cyano.
Ther really should make that stuff blue or something. Becuse it's clear (and not scary looking)I'm sure most folks would put too much in.