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Is there a controller which can check you’re parameters like ammonia nitrates alkalinity mag/cal?
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What you are describing is less of a controller, and more of an automated water testing machine.
reef kinetics reefbot makes something like what you are talking about. Neptune Trident can test ALK, Ca and Mg but I think that is it.
Before spending that kind of money on automated testing, I would encourage you to get a proper controller first. Neptune APEX was my choice, but Profilux is also popular.
I will share one more opinion on testing, in order of importance and frequency. (i welcome comments to the contrary; always open to hearing informed opinions!)
Daily or every other day: Salinity,Temp,Alkalinity
At least weekly: NO3, PO4
At least quarterly: Mg, Ca, I, K, other
Once/twice a year: ICP (ATI or Triton)
(Unless fish are dying) Never after cycle is complete: Ammonia, Nitrite
Man I’m doing everything wrong I don’t even want to say what I test and how often

