My goldfish wre spawning (or at least I think they were ) but the next day unsightly greenish tinged froth was all over the pond. I scooped it off but the next day my fish were totally off their feed. The only difference lately is I have started giving them frozen bloodworm and frozen Daphne and also put some water hyacynths in the pond . Having said that my fish are attacking the plants roots and tearing off lumps of the roots . Please help because I so love them all