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Until I get some type of controller I took one pump out of the system for now. I placed the other in the middle back glass pointing in opposite directions.
Edit: I forgot to mention that the two pumps caused some irritation on my hippo tang. Looks like little air bubbles or sand on its body...
Here is the only concern I had which was the magnet. Only this one fell apart so I glued it together. Since I am using it on the outside of the tank I didn't feel it was worth the trouble of returning.
Paul,
Third paragraph from the bottom, last sentence.
"Hobbyists willing to spend approximately an extra $100 can combine the latest generation Koralia powerheads with a Hydor, JBJ or similar controller to create even more varied water flow patterns within their aquarium."
Tony,
I found this review; hope it helps.
Edit: First link didn't have the details.
http://www.aquariumdomain.com/Product_Reviews/KoraliaMagnum5_Review/Hydor_Koralia_Magnum_5-Product_Review.php
According to this review they are controllable.
Well, placing them at opposite ends on the back glass tank and pointing opposite didn't seem to work out. Still much flow out front and I didn't like the way the adapters were directing the flow. I decided to place them on glass sides of the tank. It still seems like to much flow and am...
Just looking for suggestions on where to place the new powerheads. I currently have one on the left and right side on the back glass. The pumps caused the sand in the corners to blow out and make a small mound on each front corner, see pics. Should I place them in the middle of the back glass...