Will you be going with an SPS dominant tank? The reason I ask is that the set up costs for calcium reactors can be quite significant, where the reactor is only one of the pieces necessary. In addition, you will need a reliable CO2 regulator, CO2 tank and a quality feed pump.
its currently an SPS tank thats taking 65-70 ml of alk/cal a day. And im dosing trace elements manually.
i have a regulator and c02 tank, just need the reactor, feed pump and another PH probe for the apex.
I sent you a PM about a nano Octopus CaRx I have on hand. The Aquamaxx cTech reactors get good reviews from the users of their larger reactors. I’m a fan of GEO’s Reef reactors. Just note that their nano 510 calcium reactor was meant to be used with a CarbonDoser regulator so it does not have a bubble counter. You can buy an add on bubble counter for $8 on Amazon.