Yes , you are probably expecting too much but count it as a learning curve. The ZWO120mc is a capable planetary & lunar camera and will be fine if and when you upgrade scopes. The Mono version would have been better, but then you would need RGB filters as well and that would've added another level of complexity.
The best Minus Violet filter is probably the Baader Semi Apo Filter, you really only need the 1 1/4" version, doesn't completely remove the blue fringing but reduces it a lot. Once you have an EQ mount treat the set up as an initiation into the dark arts of imaging and learn as much as you can about tracking and framing the object you want to image and what frame rates and gain settings work best for you. There is plenty of info and tutorials online for you to peruse to get you started. Just don't expect images like you see on here and elsewhere until you upgrade scopes but learn as much as you can in the meantime.
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