I have a 2 gallon beta tank with a well used piece of mopani and some anubias under a standing lamp with a CFL bulb. I'm using an air pump driven mini filter. I'm developing a layer of slime on the surface of the water which when I run my finger through it, it shows up white against my fingertip. While on the surface it looks semi transparent and veiny. My wife's tank is beginning to show a simliar problem. I'm thinking it must be something in the tap water which freaks me out quite a bit frankly!! Any other ideas?