Question 2, water flow and designs for reef tanks

[Johnny Reefer]

Originally Posted by Ruth

...... They basically can be set to control the amount of juice (flow) that the powerhead has as well as have it turn off and on at preset times intervals. .....

Thanx for the reply. Inevitably, I’m still a tad unclear on how these work (or more accurately....what they do, in this case).

So, I took the term “Variable Speed Control” to mean that if this PH (6100) is plugged into the controller, and that controller is programmed, that the PH’s flow rate would fluctuate throughout the day (and night) independent of any further fiddling from the aquarist. Now I’m thinking this assumption is incorrect. Am I now correct to assume that the controller is not programmable, so to speak, and that if I were to want to change the rate of flow of the PH that I would have to adjust the controller each and every time?

Also, other than during feeding times....what is the advantage to having the PH turn off?

I’m wondering if I can justify the cost of a 6100 PH and a 7091 controller when that combo costs just as much as two 6080’s.

Thanx much,