The same thing has happened to the goldfish ponds. The water was really cloudy a few days ago when I found two dead birds in the bottom pond. I was going to change the water but I never got around to it. Now it's too late... the water is crystal clear! It's odd that both the tilapia and the goldfish cleared up on the same day. I built the goldfish filter in my second batch, which was almost a week later... despite this actually the goldfish were clear a couple days before I found the birds. Maybe it has more to do with the age of the pool than it does the age of the biofilters. I built that pool a week or two before the talapia pool but the tilapia had their filters built first...
