Like the previous poster said a skimmer is NOT necessary. Many people (including myself) don't run one. I did turn my AC70 into a refugium though and that likely helps a bit. Just do a 10% water change every week or so (I sometimes go 2 weeks between water changes on my 10gallon but do more than 10% in that case). Have to keep up on the top-offs too which you will likely find gets annoying in a 10G.
A power head is definitely recommended. The Koralia Nano is what I'm using in my 10G and it's working great. My clownfish loves it since he can just swim against it's current all day and it gives great flow to my tank and corals.
I'd also suggest to stay away from the anemones in a tank that size. Everything I've read says they prefer larger tanks and most varieties do get quite large. Look into getting a fragspawn instead maybe. They look great, easy to care for and easily do well in a 10G (not to mention cheaper too).
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