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Seeing can really play havoc with the quality of your views, and your mind for that matter!
An easy way to tell if it is the seeing, is to defocus the star so that you see the "donut". Don't de-focus too far though, only about a turn or two of the focus knob. If you can see rapidly moving waves of turbulence and shimmering, it is the seeing. If you are seeing slow moving "worms" or a heat-plume type effect, it is tube currents.
If the seeing is poor, an in-focus star will appear to shimmer and will appear fuzzy and hairy, sort of like a "koosh ball".
One of the easiest ways to diagnose poor seeing is to slightly de-focus Jupiter or Saturn. If you see a boiling effect, seeing is poor.
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