Twiggy, I am finding after keeping 3 mags under T-5s that they are fine for this species. I've read supposition about mags moving under this type of lighting, but mine haven't one bit. I question whether those who have proffered that suggestion have actually kept a magnifica under T-5s--or perhaps if they have, the T-5s were in some way deficient. ATI are good quality fixtures, and assuming you use good quality bulbs and change the bulbs at the end of the useful life, I expect you should be fine. One caveat, mine are within a foot or less of the bulbs, how deeply they can safely be kept I don't know.