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Aqua Clear. But with a Nano tank you might not need a filtration unit IMO... Just LR and some good Flow would do the job just fine... and some PWC's weekly...
I'd go with an AC110 and modify it for a "fuge." You can 'Search' this site as I've posted a couple links in the past for how to modify them (very simple).
They are regarded as one of the lower end systems, but the Extreme Pro is the better of the two. Usually T5 systems are "ranked" by ballasts, reflectors, fans, and overall performance/power.
You can still grow decent corals using one. I'm not saying they are bad units, just not as performance savvy according to lighting "experts" I trust and reviews thereof.