Skimmer or Chaeto

[hillegom]

If you want to add O2,You would have to have the lights on above the chaeto 24/7
Also, what happens if the power goes out? The skimmer stops of course, but the cheato would consume O2 without the lights. This happens to everyone, of course, so an airstone on a battery solves that.
I would have both
HOB skimmer and chaeto in the sump