Tall tank flow question

[smb2415]

Let me start by saying, Im still very much a newbie at this. My DT is 42" tall (7' long x 3' wide) and I believe I am experiencing some flow issues on the bottom. Perhaps I should have plumbed for closed loop, maybe I don't need any additional flow, or perhaps my idea of using additional MP40s will be suffice.

Im wondering what is the height of your tank and and if you use any closed loop or other flow for near bottom flow?

Reason I bring this up is -- I am fighting cyan and Im not making much headway. My lights run about 10-12 hours daytime - ramping up and down, then have about 9 hours of reduced moon phase lighting, and the rest lights out.... if my memory is correct. Return pump is a rifle hammerhead, valved down so I have a controlled waterfall on the coast to coast. theres (4) 3/4" returns 2-middleish, 2 rear. Then theres an MP60s center mounted, on length of tank, about 1/3 down from top or about 8 - 16" down (varies between each end).I can see that theres "room" for increased flow down low.

To combat the cyano last night I vacuumed a small section of the deep sand bed (a choice I made, for a few reasons) and removed quite a bit of detritus along with cyano. I believe this points back to needed more flow and feeding less (which Ive started curbing already).

 

[Shadrach72]

Those dimensions put it about 550 gallons or did I read something wrong?
:jaw:

 

[tigerdragon]

If dim are right yep thats a 550 gal and you dont have near enough flow. What are you running for livestock? Corals? Need more info

 

[tigerdragon]

In my 90 i run close to 3000 gph flow this does not include the return

 

[tigerdragon]

Before adding more power heads look into the maxspect xf150 gyre pump. This thing is great and it moves water its pretty much the only thing i am running cept the return and i have flow movement everywhere

 

[smb2415]

yes, the tank is 550g. The hammerhead (5300gph@6') pushes out quite a bit thought its (2) 2" returns each with (2) 3/4" loclines. The (2) MP60 move quite a bit (3500-7500gph/ea) as well.

The upper portion of the tank has more than enough flow. I have to tame it down so I don't create a wall of water over the overflow.

The lower portion of the tank is where It seems much more calm. I don't think the gyre will work down that low or require mounting lower and having a wire running up the tank (no good), perhaps get one gyre in place of an mp60, however the flow would be greatly reduced as the largest model isn't are enough.

Tank is 1 year old (post cycle). There about 30 fish in the tank. Mostly small (young) less than 6". Largest is about 6". I need to replenish CUC as my puffer did a good job on them but theres still numerous small, dozen turbos, a dozen margarita, not sure how many nass. I have 3 conchs, and 2 engineer gobies. sand bed is deep at 6" (my choice for a few reasons).


gives you a good idea of scaping and placement.


gives scale of size



so my thinking is more vacuum current mess, more CUC, add MP40 close to sand bed and between two piles, and feed less?

If anyone knows a source for bristle worms other than IPSF or live rock please do share.

 

[tigerdragon]

Check out coral vue's you tube page on the gyre the xf150'can push 5000 gph. They have put it in 6' long tanks 30" deep and had flow all the way to one end down to bottom and back