I have the pink version 9w, 10 submerged. I know exactly what you are talking about. My cheato never spun like that.Was considering that to avoid spill light on me but my HOB too small with the basket in it although I might try it with the basket out. For my next larger test project. That's an option with either above and below lighting or side to side depending on compartment.
Did you get the pot like illuminating Blurpish version or the higher submerged wattage white light. Jake Adams went the white light route. More expensive but I believe outputs 22w submerged and if memory works had two on opposite ends with Chaeto rotating.