Looks like all those fixtures are 4 bulbs? Your fish won't care too much one way or the other. If you're going T5 on a fowlr
, the amount of bulbs you need is really dependent on the look you want in your tank. Depending on what you want, you may be fine with a 2 bulb fixture...1 daylight, 1 actinic; 2 actinics etc. It really just depends on how you want your tank to look.
Any idea what you might like?