Okay... thanks so much, this is really helpful. I've just about got my entire setup spec'd out, just need to close on my mortgage refinance before spending the big bucks on the aquarium setup.
Ideally they are placed on the sides, since this is usually the longer sides of the aquarium and the best place to get the flow. Placement is best at about 8" from the top I think is what EcoTech recommends. I had a Koralia on my Apex and it was programmed to turn on/off every few hours and it is an very audible click for sure. Startled my fish and was annoying for me since my tank is in my living room. I trashed that idea and eventually got an MP40.
