to be honest, I rarely use microworms for adult paros, – to me it looks as if they dont really see it, and dont ‘go for it’. If all my other food fails, I will feed them microworms, which I always have, – and I do think then the adult will at least not starve. But a preferred food I would not call it.
Moina are excellent, – but difficult to maintain. Some years ago I had some cultures, and I had no problems maintaining them, – but the last years all of them dies off after a couple of months.
I am sure someone will come around with some good methods, but otherwise you can search around here in the forum, or on the net in general, – there will be plenty of good ways.
I have always fed mine yest (also in the good days)
The biggest problem I think is perhaps the maintenance of the container they are in. I believe when I had success with them it was due to the fact that I kept them in small containers in af closed old aquarium with a tight lid and light on. Since I wasnt able to do this anymore – but have kept them in smaller, less light, and no closed lid – I failed.
Nowadays I dont have them