T5 to MH

[Tracey2]

Everyone else is going the other way but I really wanted to see my tank under mh lighting and I needed my T5's elsewhere so when I found a cheap homemade fixture I took it. The mh's are 175w 14k and they came with vho. I love the vho and couldn't believe the colour pop especially greens, way better colour than with my T5's but I find the mh's wash out the colour, especially reds.

First question, should I switch the 175 mh to a 10k or 20k or could it just be the make of 14k, are all 14k's the same?
2nd question, my corals are used to 4-80w T5's & 4 54W T5's, how long should I leave the mh's on to begin the switch to mh? I don't have the new fixture mounted yet, it is just sitting on my tank so I don't have the luxury of raising it higher yet.
3rd question, should I go back to my T5's with the addition of the vho's?

I do like the shimmer of the mh on my sand and feel I could probably keep more coral or even clams on the sand.