I'm not exactly clear whats being sold there. The picture is of a 6 lamp fixture, however it only includes 2 bulbs, and you can't fit 6 bulbs with seperate reflectors into the 8 3/4" width that they specify. If you go to the bottom and click on the 6 lamp fixture, that one is $225.
I don't see any reason why the fixture itself won't work. The ballast should drive any T5 HO lamp. This fixture won't have the waterproof end caps, so don't mount it too close to the water. If you get the 6 lamp unit, find out what the width is and make sure it will fit over your tank.