what to do for flow in a 70

[kwirky]

Originally Posted by fencer

IMHO I would think placement is more important.

agreed. once you have rock in it you can decide where to place the powerheads. When the rock's cycling (without corals in the tank) is a good time to play around with placement of your powerheads. What kind of coral are you planning on keeping? Acropora and hammer coral require completely different ammounts of flow.

The direction your powerheads are pointed and where they're pointed to can make a difference in your flow. Pointing a powerhead to push water over a big open area of the tank seems like it's not making flow but it's building up momentum which churns over a great deal of the rest of the tank.

Pointing it directly at rockwork will create localized turbulance that has some nice wavy motion but is isolated to a small area of the tank.

[DanG]

I guess I'll have to play with it when I start moving rock over tonight or tomorrow.

[andresont]

There is never enough flow for SPS IMO, just look at the real reefs, and waives.
What we have in our tanks is miniscule compare to the currents and tides.
I have SPS growing in 36" long tank with lots of flow and some are very close to the tunze 6100 are the most happy and fast growing ones.
Softies and LPS need less for sure.