I was out of town for a week, My Wife fed the fish while I was gone. She knows how too as well as how much, so no over feeding here. and when I returned she said it appeared with in the last two days. its a thin layer of greenish Blue ? and it looks like a thin blanket with holes in it . It is aloft ontop of the sand ever so lightly. STRANGE.
1. What is it.
2. What caused it.
3. How do I get rid of it.

1. What is it.
2. What caused it.
3. How do I get rid of it.