The potassium isn't so great either; about 450mg of it in the whole bottle. I couldn't dose a 20 gal for a week on it. In all honesty, I'd just gut load some live food with spirulina powder or buy yourself some good fish food heavy in spirulina. You'll find it has pretty much the same nutrients, but you don't have to risk fouling the water to do it. If they're deriving from spirulina, they'll be neglecting to mention the massive quantities of protein that they're getting you to dump into the column.

I'm also seeing that they combine a ton of sodium benzoate with ascorbic acid. I'm not sure it'll hit dangerous levels, but if it were to convert completely it may be a problem; at least about 675mg/L. Now how much of it will actually change over is beyond me.