They're in a plastic pond, about 700 gallons. 500 or so tilapia. But no, nothing out of the ordinary has happened with their environment. I may have been overfeedin. Ammonia and nitrite was about .25ppm.. The skin turned darkly pigmented just on ones head yesterday and seemed to have no energy.. I've been feeding them only once per day since it began to happen. Other then purina grower 600 they have nothing else, some duck weed too when I put it in.
What are you using for filtration, how many pounds of fish do you have per gallon and how many pounds of food are/were you feeding daly?
