Confusion over flow - shallow reef

drmantistoboggan

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Hi everyone,

I'm a little confused over what type of flow I need for my tank. Everyone seems to constantly say you want more and more flow. I have a waterbox 80.4 frag tank as my display. The tank is 4 feet long but only about 12 inches tall. I have been utilizing equipment from a previous 120 gallon build. I am running a varios 6 pump and have an icecap gyre 3k on the short side of the tank flowing length wise. The 3k, even at low settings seems like overkill (very easily kicks up sand and creates dunes since there is only 12 inches of tank space and I have a 1.5-2 inc sand bed), I have blocked a good chunk of the gyre's flow with rocks to compensate for this but it feels like it kinda defeated the point. My varios pump isn't working that great anymore and I am in the process of replacing it (looking at the Sicce SDC 6.0).
I recently removed the gyre from the tank as I didn't like the way it looked and I currently don't have a lot of coral (Just a small frag of xenia). I was planning on getting some LPS and softies in the next few weeks which brought me back to flow. How much flow do I need for a shallow reef that is going to mostly be lps, mushrooms and softies? I want something that is very low profile as the tank is right in our living room of our small apartment. I was looking at the mp40 since they could be put on the back and are great for hiding cords but would this provide the right flow patter since it will be directed from front to back? Ideally I think you would want 2 mp10s but that's a lot of money. is a tank this shallow with two return nozzles pointed at each side able to generate enough flow from that alone to which I could just crank up my return pump? I also saw the vivid creative aquatics random flow generator return nozzles and wondered if those combined with cranking up my return pump would be sufficient?
How would you all handle flow in this type of tank?
 
With a long shallow tank I would run the flow in one direction as they do in a lot of LFS shallow display tanks. (laminar in circular pattern ) since you dont want to use 2 mp10's. Maybe put the mp40 on pulse mode at the lowest setting as high in the tank as you can.
Other option is the Jebao 10's. They are about $50 ea. but you have wires in tank
 
With only 12" depth, if you arent using a coarse sand, it might be next to impossible not to blow it around a bit.
 
MP40 in 12 inches of water even on low I think will move sand as much as the gyre.
that's why I originally thought maybe 2 mp10s may be the better option? I could maybe just get one mp10 and make one side of the tank a high flow are and the other a low flow area?
 
With a long shallow tank I would run the flow in one direction as they do in a lot of LFS shallow display tanks. (laminar in circular pattern ) since you dont want to use 2 mp10's. Maybe put the mp40 on pulse mode at the lowest setting as high in the tank as you can.
Other option is the Jebao 10's. They are about $50 ea. but you have wires in tank
problem is i really don't want to block the view from the side, i want to try to utilize the back wall if possible.
 
Can you do MP 10s on the back wall? Or move the gyres there? I dunno. Flow is definitely important. I’m a Die hard gyre fan.
I could consider maybe selling the 3k and placing two smaller 1ks on the back wall? that might work, it would be more intrusive than 2 mp10s but would be much cheaper.
 
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