I currently seem to be having an issue with cyano in my sump. Someone once told me that a lot of people have problems with cyano there as the flow is reduced.......I have no cyano in the display just in the fuge section of my sump. Is it possible to put a small power head in the sump just to ad movement? seems that there is not very much flow through there. I have a 600 gph overflow and a 900 gph return pump....the sump/fuge is about 20g under a 75g display. I have a Remora Urchin in the intake section of the sump with the fuge in the middle and the return on the other end. My parameters are dkh 4 meq/l, ca is 420, phos and nitrates are not an issue. My ph is 8.3 and temp is 78-80 night/dayI have a canteloupe size ball of cheato and a handful of red gracillara in my sump along with a small bit of feather caulerpa. I run the lights on the fuge about 12 hrs. I have 7 baby bangaiis that are living in my fuge after taking a ride down the overflow after they were born about 4 weeks ago. Any advice here would be greatly appreciated.....