confused

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Hey ashera,

yes, a skimmer will definitely add O2 to the water as they all use air bubbles to help pull out the proteins in a tall water column. Do a bit of searching or research before investing in a skimmer though as some are excellent, and others are next to useless. I recommend a aqua-c remora.

As for the nitrates, if you got cyano back so suddenly, I suspect that high nitrate levels is due to too much feeding (that is most common as well) so try cutting back the food. Clowns are pigs and eat too much anyway.

Good luck!