I was talking to a friend who has a reef tank and I mentioned I'm going to have to get the CO2 tank that powers my CA reactor refilled in a week or two. My friend said since I have an Apex I should look into getting a DOS. I hadn't thought about it before so I thought I would look into it. My question is when you run a DOS do you still use a PH probe to control the dosing or do you have to buy some other type of probe? Also, does the DOS include a reservoir or do I just insert the hoses into the additive bottles?
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