That's discouraging news Vincenia, but good to know. I was just going to put up with the light but if that's an indicator that my filter is about to pack in, I guess I'll start looking more at lights that I can put on it. I'm not willing to pay for a new filter unit. Here they aren't quite as expensive as the tank itself but not far off. When I enquired about one they wanted 50 or 60 dollars for it. I've been reading about how to get the holder off the glass. It doesn't seem that hard so I think that's what I'm going to end up doing. Even though I really like the water fall, I want nice plants more.