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					Originally Posted by Sasq40  I got the tank used a a few weeks ago and was looking a little rough when I picked it up,  had lots of hair and cyano.  So I've been doing water changes to bring and down and it's been working. And yeah I should have done a lot more but I trusted he knew what he was telling me cuz his tanks are beautiful.  I could have misunderstand what he said to so I'm not going to just through him under the bus. I got the kalkwasser from jl it's the bigger container they sell.  I had around 12 tbsp in 13 gallons of ro/di and was thrown in over night with my ato
 
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 Your ato fills 13g of water overnight or 1.3. if so then there's your issue along another of why so much water ,  also 1 Tsp per gallon is the Starting dose not tbsp and make sure your ato isn't dosing too much at a time or besides what you got visibly you could get get ph spikes as well. 
If your going to run Kalk make sure your dosing any other cal/Alk supplement and test your water for a while to make sure it's doing it's job or isn't.