Last night I guess I was feeling a bit more creative than usual. I spotted an old railroad light (Ya know the kind, has two lights the randomly blink at diffrent times) So I pulled the lights and sockets off of the frame and I cut the green light off. Then I taped the ending with (A little to much) tape. On my 5 gal
I have a large square opening and a smaller narrower rectangle opening that my filter is hanging off of. So I stuck the light in the rectangle and it was a perfect fit. Now the tank shines red at random times. I think it would be better if the green light was there, but there was no room
So try it!