Hello my name is Debbie and I'm a new Koi Pond owner. My pond is 7 mths. old and I've already had one problem with string alage which I over treated and killed all my fish by mistake. I've since drained and cleaned the pond and just began again on Sat,. with 2 new fish. I've since learned that these two are spawning and I've notice today quite a bit of foam in the pond and I don't know what has caused this and I'm trying to find out. Any answers there will be appreciated.