I think all depends what corals and creature you going to put in the tank.
This could go long way. Sounds like you prefer the led, even because when you mention Ati fixture you said going to use E5.
I have mostly sps so will tell you definitely t5, but also before used led ,from the Cheap Aqua mars to kessil a360. The growth I get with t5 can't be compare to the led light.... now if you plan to fill up the tank with softies, zoas, anemones lps you can definitely go with led , makes the color pop more.... but honestly don't waist your money on the led t5(E5)... are too expensive and you better go for a decent led fixture , just think about a 36" E5 bulbs is around 100$ each, I like mine just to make the corals pop but will not rely on them for growth, just my opinion
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