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Green hairy algae is often associated with not enough CO2<-> to much light. If you can add more CO2 then do so, and if not: lower the light. Remove as much of the algae as you can, or hire some amano shrimp (caridina multidentata) to do it for you.

I agree with Darrel, removing it mechanically either by you or some nerite snails, amano shrimp or algae scraping fish, is the best if not only way to get it out of your tank. Does not look that bad to me...

Thnx, the chart is supposed to show how the amounts of carbon acid, CO2, bicarbonate and carbonate relate to each other given a pH value. Not how much of the CO2 will be turned into carbon acid or bicarbonate. For example: let say I have a tank whit pure RO water whit a pH of 7 and I start to...

Yes, most CO2 stays CO2. however in most cases there is already bicarbonate in the aquarium water, and there is balance between carbonic acid, CO2, bicarbonate and carbonate depending on pH -value. Its hard to explain in a language I don't master properly, but maybe this figure shows you what...

you're right my mistake, forgot about the moles. HCO3 61 g/mol CO2 44 g/mol lets try it again. at pH 6.4 the amount of dissolved CO2 is exactly the same as the amount of HCO3, which forms the KH, (at least at this pH value) 1 KH is 21.8 mg/l HCO3 is 0.0218 g/l 0.0218/61= 0.000357 mol/l so...

at pH 6.4 the amount of dissolved CO2 is exactly the same as the amount of HCO3, which is your KH. 1 KH is 21.8 mg/l HCO3.

What is the KH if I might ask?