There are far more in-sump skimmers to choose from than there are hang-ons... Many of the inexpensive hanging ones are crap so do some research before buying.
I just have a regular powerhead sitting on the bottom of a garbage can. That is all that is needed to mix up new saltwater. However some people go a step further and add an airstone and maybe a heater but those aren't needed in my opinion.
Magnet holding systems are better in my mind than suction cup hangers for holding powerheads. Calcifying organisms and algae will eventually cause suction cups to fail while magnetic mounts aren't effected by such things.
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