My 4 un-modded mj1200s have been in service controlled by a Red Sea Wavemaster Pro for almost 2 years with no probs. (Well, the cord on one of them fried when there was a leak and *someone* had neglected the ol' drip loop.:bash2 I do, however, keep a replacement impeller in the drawer of my cabinet - just in case.:up:
the mods I am talking about are not the sureflow and the like kits. I am nore talking about cutting off the the output spout to increast the opening size. Also drilling holes around the input side to increase flow.
OK now I am confused. With the Koralia is the only problem going to be the propellors occasionally or do I even want to control my power heads with a AC jr.? They advertise it can be done.