I can still dose at this point and keep up easily but in a few months I'll probably need a calcium reactor. I want to have a PH controller that will work with it too. Hoping to keep it out of the sump. I'm becoming partial to Precision Marine stuff so that's one that I'm liking right now. Would like to hear pros and cons of brands. I think I've read the PM doesn't have a good place to put the PH probe. My head is spinning from all the brands of controllers too.