I've gone Tunze/flow happy in both of my tanks. The 135sps has a closed loop/Dart and 4 6100 tunzes on a controller. I just bought another 4 and controller for the 240 anemone/fish/softies. With sand in both of them now, the sand is blowing all over the place and creating dunes no matter where I shoot the flow (135). I've got the 4 in the 135 turned down to 30%. Haven't hooked up the 4 in the 240 yet, but with just the hammerhead return pump, I'm getting movement on all of my corals/anemones.
Q:What am I trying to achieve in both of these setups regarding flow? When do you know when you have enough/too much/not enough? Is a wave the ultimate flow or random or what? Sps are supposed to have tons of flow, I've been told. Why?