I still have bubble algae issues, which I have heard do not seem as iron dependent as many algae are, and my sump algae is now leaning more towards brown then green so I figure its definitely time I start dosing iron. I also have not done a real water change in close to 2 years. Anyone have a recommended amount of iron for scrubbed tanks that dont get water changes, and all nutrient export is via algae growth? I have a fair amount of macro algae and a couple mangroves as well.
RHF seems to advocate putting 27 mg ferrous gluconate (1 fergon tablet) in 20 ml of water and then dosing about 1 ml of that solution a day for a 300 gallon system, but that the exact dosage isnt critical. Do does 1 mg/day sound about right for a 90 gallon scrubbed system? Or should I be dosing more?
I found 8 oz. food grade ferrous gluconate for $14 + $7 shipping: http://www.aquariumfertilizer.com/in...ShowItemStart=
Does that stuff look ok for iron dosing in a reef tank?
1 oz = 28,349.5 mg, 8 oz = 226,796 mg. So even if I was dosing 2 mg a day, 8 oz should last me over 600 years......