Sup guys...I have a waterbox reef 130.4 with 2 Nero's 3 running on random flow..there running at 50% power...is that enough flow.......ruturn pump is 1600 gph... I was thinking of putting a smaller powerhead in the back of the tank closer to the sand to get some flow around the rocks and on the sand.. because I am having cyanobacteria problems tank is 2 months old...here's a picture of placement of the Nero's 3 and videos of flow