Question 2, water flow and designs for reef tanks

[Johnny Reefer]

Originally Posted by Ruth

Yes the 6100's have to be run of a controller - it is whether you go to a single controller or a multi (up to 4 powerhead) controller. I have only used the multi controller and have never really investigated the single controllers.

So how the heck does that work? A controller varies the amount of juice going to the 6100?
(I don't mean to get off topic, but I don't get the whole controller thing. . Seems that they monitor parameters, but do all this other stuff too? Like a fancy powerbar, and more? All very confusing.)

Thanx much,