Water movement

[B192734]

Hey all. Just a quick question here. How much water movement do you guys have in your nanos? Right now I have a 20g running. I'm used to larger tanks, and normally look for quite a bit of water movement. With this smaller tank I'm kind of unsure about it. I have a little Skilter filter/skimmer, and a second cannister filter on. I normally don't run the cannister, because when I do it seems like there's so much flow that the tank doesn't have a chance to really open up. Is there a point where you have to much movement, or will corals adjust to it and be fine?

Right now I have in the tank:
2 hammer corals
candy cane
couple bunches of polyps, and
a good clump of mushrooms

The fish don't seem to mind though. There's a clown, blue/yellow damsel, and a red spotted goby.

Any thoughts would be appreciated.

[nano mania]

I always like more flow. Coral will adapt. You have to think about how much current is in the ocean. Try to spread the output to cover more area. I like using the Hydor flo. If set right you can get a little wave action.

Right now I have on my 18 gal
MJ1200 w/ a Hydorflo
HOB skimmer run by a MJ 900
and a closed curcuit w another 1200

est. 600 GPH after head loss

[B192734]

My main worry with the corals would be the hammers. I know that the shrooms like it a little calmer, so they are in a part of the tank that will allow the flow to calm a little before blasting them. But the hammers I was worried about because I had read at one point that if they get to much movement they won't open, and can possibly rupture. Ever heard of tat happening because of something like this?

[nano mania]

I have seen hammers rupture.

What you really want is increased flow decreased velocity.
You need to spread the flow out.

Imagine the difference between a garden hose with and without your thumb on it. Same gallons per minute but more pressure with the smaller opening