Thanks Isabella. I was only wondering because the lid doesn't fit very well.
I have a betta in my Q tank at the moment because his main tank hasn't cycled yet. I put the cover on with the light but the light isn't a fluorecant one and Gadget (my betta) doesn't seem to like the light and sits at the bottom when it's on as if he is scared, so It's never on for very long. In his new tank he will have a fluorecant light. Also, he swims around more when the cover is off.
I think I will do what you said and put the filter into my main tank to keep it cycled so I don't have to keep the whole tank running when I'm not using it.
Thanks again.
Gwenz
