light question

[fkshiu]

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.