I jut got a couple acans, and micros, and you can tell by how puffed up they get if their happy with flow and light.
From what i hear they will lose color with too much light, That less is more with them for flow and light.
Some of the best color acans and micro's are in very low light.
(That i have seen) There are very nice ones too with more light like RandyO's tank.
Would also like to hear from the acan and micro officianado's here.
I wouldent think 150w halides are too strong. If you do move it up shorten the photo period. I do this with new acro's that dont come from 400w tanks like mine to help them adjust, and catch it before they get fried.
I am doing this as well for my acans and micros so they dontget fried as well. They didnt like 400 watt 10ks too much at first, so they are in some what shaded area's and low flow.
They are getting much better and puffing up nicely.