Bro,
Moss is a natural occurance in most impoundments usually at its worst in late summer. Chemicals are the only way to remedy that but I don't suggest it. Some occasional water flow like rain will help.

If these are your ponds, you need to manage them or you'll never have good harvest size fish. Take a look at the post I put up in the tread called "Electroshocking".
I would take the smaller fish and either destroy them or eat them depending on their size. Leave everything in the 12 inch plus size to grow and reproduce.
Also, you may need to add Blue Gills as a food source and some Channel Cats to keep the system healthy.
Be careful where you get your supply. You do not want to contaminate your pond(s) with an ovary disease or worse.

Good luck Brother......
Email me if you have questions.