I would try to kill any preemergent vegetation. I go through this a lot. Some of my smaller ponds dry up in drought and weeds and grasses grow. Then, when I do get rain, the stuff dies and rots. It turns the water sorta black. Fish seem to do OK in it but don't appear to thrive. If I could forecast rain, I wouldn't let it happen.

Plant bermuda or something to cut down erosion around the pond and especially on the dam.

Moss and algae need three things to grow. The first 2 are temperature and sunshine. The third is nutrients that wash into the pond. Try to cut down on leaves and other organic "stuff" that wash in with rain. BTW, over time, you will get some moss.

It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.

Without a sense of urgency, Nothing ever gets done.

Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP Grandpa