My neighbor is having troubles with her fish. I think I know what the problem is, but I don't want to go giving advice when I'm not sure I know what I'm talking about.

Our neighbor keeps freshwater fish, a huge tank with a pair of gorgeous oscars and a tank with fancy goldfish. She keeps these tanks... pristine. Really really clean. And she also has some snails.

The snails are now attaching themselves to the goldfish and she finds this very upsetting. Now, I figure it's probably because they're hungry and there's no bottom feeding to be had because she keeps it so hospital clean. They're probably trying to eat the slime off the goldfish, yes? And I assume that this is a bad thing.

Do you think that's the case too? Something else? Any advice? She's a sweet older lady who's very disturbed by this and I'd like to help her out.