Join Date: Jan 2008
9) Luxury Items
The last part covers what I consider to be "luxury" items, or completely optional parts (unlike the above).
A pH controller (such as those made by Milwaukee) will allow you to determine the pH of your aquarium water on a continual basis. By hooking up the pH controller to a solenoid (which is part of your CO2 system), you can have your pH controller inject CO2 when your pH goes above a certain set point, and have it stop injecting CO2 when your pH drops below a certain set point.
In my opinion, this is completely unnecessary. I believe too much emphasis on aquarium fish requiring the "perfect pH" has been placed in our hobby, leading beginners to believe that certain fish can only be kept at a pH of 6.4, or 7.0, etc.
Perhaps if you are keeping extremely sensitive fish, with very exacting water parameters required, would I see a need for a pH controller. The cost of the controller, probe and the calibration solutions are also quite expensive, but if cost is not an issue for you, then this may be a piece of equipment you would want to consider.