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BC, A well baffled 4+ watt fan should get the 10" to thermal equilibrium in no time.
The "amoebas" are in your eyeball not in the scope, if they are what I think they are.
The shimmering Moon is caused by the constant motion of the atmosphere and not your scope. Thermal currents within the tube tend to give intermittent blurring and "swimming" ghost images. It is a very different look from the shimmer caused by the atmosphere.
Sure, in a small refractor you will not see it so easily, but that is because that scope cannot handle the high magnifications needed to see it. The atmosphere is never still. If you push the magnification high enough you will always see a shimmering Moon.
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