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Are you asking if you can put a T5 bulb into a regular florescent outlet? If so, then no, you need a specific T5 fixture as the bulbs are a different size.
Is it a single bulb? Those glo fixtures are overpriced IMO, but $40 isn't bad if its a 2 bulb unit. If it is a single bulb unit, it won't do much for you depending on the tank size, but if it is a 55g, a single t5ho would give you enough light for some low light stuff
Ok. I'd probably go for it then. That's not a bad price for a 2 bulb unit, assuming it functions properly. Make sure to test it out before you get it. You may also need to get new bulbs for it depending on how old those are. After a while (1-1.5 years) the bulbs need replaced.