i currently have a 24 gallon fluval all in one system. I use real ocean water and change out 1 gallon of water per day and do NOT currently dose my tank. It's getting to the point where i have so many corals in the tank that dosing is becoming a necessity. I intend on still using the ocean water but need a dosing system. Dosing by hand is not an option, too easy to kill things. I'm looking for an easy system. Not sure if they make them or not but if they have something that has probes for CA, ALK, and MG and correct as needed on it's own that would be the ideal system. Anyone with experience have any suggestions?