I added a UV light to my pond and after a few days it went from green to brown. The water has cleared up enough to see about a foot deep. I just noticed some fry swimming around some of my hornwort. The problem I am now facing is an ammonia spike. I am guessing this is from the dead algae and maybe from the fish spawning? I was wondering if the soil from my water lily could leech ammonia into the water. I just used some dirt from my backyard and covered it with lava rock. Hopefully it clears up soon.