Flow Flow Flow

[davebailey46]

Can you guys give me some help/feedback on my current tank flow. The tank is a 72 gal w/ overflow and I cant seem to get the flow right with the obstruction of the overflow. Currently I have a 2 900 MJ on each side and a MJ1200 in the center on a rotating deflector. I should be pushing a total of 1200 GPH. I am fighting Cyano and need to keep flow in the dead corners? I am thinking about pushing the large formation on the right back almost to the glass (right now it is sitting forward of the overflow) leaving a large patch behind? or adding a another MJ?
Comments please?

[seaham358]

Thats a lot of flow in a 72 IMO... If you have cyno have you tested for PO4? It needs food to live. You do need low flow areas in a tank where fish, inverts can get a spot to take a break if they want. In the wild there are low flow areas. JMO

[davebailey46]

Yeah seachem Po4 kit shows 0...

[ellisz]

I have 2 MJ1200's and a Seio 620 in my tank. That combined with my main return I push about 1800 gph in my 75 gal. The swirl attachment you have on the back PH will reduce the flow from that one.

I have considered setting up a closed loop in my tank but a Seio 1500 might do the trick as well. I have SPS so flow is what I want.

Make sure you are testing your source water for PO4. I assume you are using RO/DI water? RO water won't always be enough. How old is your tank? The pic does not look too bad really.

HTH

[davebailey46]

I just did a tank transplant in Dec to this new sump/fuge setup...I am actually (hate to admit it) using tap water and aging it at min 4 days. From the tap however seachem test in reading Phos at .05 nitrates 10 (In tank 0, and 0) Don't worry I am already looking at an RODI system with tank...What is strange though with heavy skimming and macro in the fuge I am still having the cyano issue (where as I have studied several LFS setups including a very large well respected one) and not even one uses and form of RO or DI. Actually Baltimore City water is very good! I am guessing I should fight it as usual and let this new setup settle in....

[ellisz]

Might just be a diatom bloom from the tank transplant. Some tap water might be good enough but most are not so lucky. Any PO4 from the source water can cause issues. I used tap water for years with no problems on a FO tank. Once I set up my reef tank, I had cyano bad. RO/DI fixed it.

HTH

[davebailey46]

Makes you wonder why a reef tank would have more cyano issues? I dont dose any suppliments...
Thanks for you help...