From what I've read is if they get slightly dirty they stop sweeping. For something that small I would get a maxijet w/ hydor flo and a K1. They still require regular cleaning, but I have seen some nasty coralline encrusted ones still work.
It's been working very well for my 15 gallon reef for many years. Yes, it needs a periodic cleaning, but not bad at all. I put all my powerheads in weak HCl solution and they are spic and span in 20 minutes.
Although I do like my powersweep in my 15G, I actually like Koralia powerheads a lot. Have you looked at the smaller one of those like Koralia nano? Koralia is known to have a relatively wide flow pattern.
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