There's a chance that your "free" 400w ballast could end up costing you more in the long run.
It definitely will melt your center brace so you have several options:
1. remove the centre brace and reinforce the tank with eurobracing or an acrylic base.
2. get another 400W ballast/pendant
Either option will cost significant money and you may need to get a chiller even with just a single 400W MH over your tank.
I'd go with what others have said and just stay put with 2x175W and install good quality bulbs like the Iwasaki 15,000K.
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