flow for 29gal mixed reef?

[reefworm]

I'm considering Koralias for water flow in a 29 gal. mixed reef. Any suggestions as to what size[s] and how many? The rock work is quite open, and spans the length of the tank less 1"-2", leaves about 3"-4" between the glass and closest points of rock, and rises to within 6"-7" of the water surface. Substrate is the Home Depot beach sand from a few years back.

Thanks!
-rw

[IPT]

Mixed reef will be tough because you'll have a hard time keeping low flow and high flow areas maintained. I have a K3 in my 50 Gal and it is quite a powerful little pump (I have it's flow running along the back wall)