I run this exact setup, except that my tank is 19" high.
I ran my ATI 6x24 Dimmable for a while until I got into LED's. Worked great, but acropora on the sides needed light.
But you had the 6 bulb correct? Mine is the 4 bulb.
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You can always get reefbrite blue strips and add them on the outsides adding pop
That's a super shallow tank. Just hang the thing a little higher. 4 bulb is fine. Run 3x blue plus and a coral plus.
I run a 4 bulb sunpower over my frag tank that has dimensions of 36x18x14. The 4 bulb isnt enough light for acros. Montis, birdsnest, and anything other then acros grow awesome but the acros slowly brown out and stn in the frag tank that shares same water as my DT. I'm now retrofitting the sunpower with LED's to boost par. In my experience the 4 bulb wasnt enough light for acros.
If you can still exchange it I'd go 6 bulb for sure. It's the only way you'll be happy anyways![]()
You should get a 36" unit, especially for a frag tank which you might want to fill right to the edges. Those t5 units put out very little light on the sides, so you'll have very low lighting on each end. A 36" 6 bulb unit would be my choice.