The mini is too small for a refugium, imho. An AC 500 fits well on the back, but I'd support it from the bottom, not let it hang with all the weight on the glass. Have one on my 5.5g and it leaves about 2" of room on one side. AC 300 would work too. If you think you can DIY some acrylic work, you could make your own CPR aquafuge with acrylic & pvc parts, then add a powerhead.
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