Water flow in Sump

[Glennrf38]

How much current should I be getting in my sump? The reason I am asking this is:

a) The flow in my sump does not move my cheato around at all. It just sits there on the bottom and does nothing. It has hardly grown at all in the YEAR that I have had it. All parameters seem to be fine otherwise.

b) Other systems I have seen seem to have a fair amount of movement.

How much is enough? In the main tank (27X24X24) I have a seio 600 and 1100 for current and the corals and fish seem to like this. The return pump is a "Quiet1" ???? Small pump. I can't remember the model. I was thinking of getting a bigger return pump and maybe a little current pump for the sump>

Thoughts ? Ideas ? Suggestions ? Please let me know if it would help to have more info or pictures.

Thanks

Glenn