Is it possible to use a ballast on a 2x54w (46") to power a 4x24w instead? Most of the info I see on the ballasts saw 1 or two bulbs, but I'm assuming that is for the max length/wattage those ballasts will support?
Right now I'm running two of the Lithonia 2x54w fixtures which have worked really well despite my lack of DIY skills. They are in a DIY hood over a 60 gallon tall tank.
I went to my LFS yesterday and found out they are going out of business
. They had some great deals going on to clear out the store and picked up a 60 cube with built in overflow, stand, and hood for $350. I'd like to use as much of the equipment as possible from the 60 tall.
The new tank:
Right now I'm running two of the Lithonia 2x54w fixtures which have worked really well despite my lack of DIY skills. They are in a DIY hood over a 60 gallon tall tank.

I went to my LFS yesterday and found out they are going out of business

The new tank:
