QT lighting for SPS

I use a t5 fixture from nova extreme over my 10g QT. I can't remember the specfic name but its on marine depots site. I use the small one.
 
I use the same one, I think, it's a 2 bulb system 1 white, 1 actinic, each about 18 watts, they list it at 18" but the bulbs are actually 15.5", I've been running it on a 10 gl tank for 3 yrs., I keep frogspawn, mushrooms and tons of xenia in it.
 
Are there any decent 18" bulbs? Or do you have to run at least a 24" fixture to get some ATIs, etc.?
 
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