My pond in behind the garage. Last week I had an old asphalt shingled roof taken off and new one put on. When the workers were doing the roof, they blew the debrie off the roof. I noticed the pond water was getting foamy bubbles. I know some of the shingle stones and maybe tar paper pieces got in the water and sank. Two days ago I noticed the fish laying sideways and not swimming around. 1 of the orange goldfish got real pale and looks like he has ick. They do eat when I put food in. Is the water contaminated from the shingle debrie?