Diy Lighting Help

[robr28]

Hello everyone.
I have an old MH lighting system that I used to use on my 100 gallon tank. It has two 175 watt bulbs and two forty watt actinic tube bulbs. With two fans and 3 separate cords for timers. I now have a 37 gallon tall reef tank. It is being lit with 2 14 watt coralife HO and one 28 watt coralife HO. I want to use a combo of MH and actinic for my 37 gallon tank. So I took apart the MH put all the pieces aside and cut the lights housing to the right size for this tank. Put all the metal halide parts back in the housing and so far it looks like a mini version of its parent.

So that part is done. My question is the two ballast for the actinic the specs on them say {high power factor/input 120v ac 50/60hz/max current 1.82 amps/fcc part 18a/class p/type 1 or 2 outdoor. } The bulbs that fit into the old housing were 48'' long. Will these two ballast work with smaller tubes say 30'' long that would fit into the new housing? Or should I use the coralife lights with all actinic bulbs in them? And if I go with the coralife should I take the units apart? And will the coralife break if I try to disassemble them ? I'm very handy so DIY are not a problem for me. But I would like to pick some brains for ideas and some help. Also My tank is 23'' deep and 30 '' wide. I be leave I read some where that 175 watt MH were good lights for that depth of tank. And could be kept 5 to 15 inches above the tank. I may be wrong and I don't want to kill any of my tank buddies so If you think this will be to much light then let me know what you think. And before we all start talking about heat Yes I do know that MH's heat up the water.
Thanks again and any ideas will be appreciated.