Hi, sorry the title is a bit vague, but so is my knowledge of lighting! Basically, I have been given (well, for a donation of Â£5!) a 60x30x30cm Rena tank with the standard hood and light that comes with it. I have been lurking here for a week or so, trying to soak up as much info as possible, but I'm still unsure about the lighting! My OH says "don't bother, stick with what you've got" but that is 1 x 15W Sylvania tube. I am only planning on a low light, low tech tank as it's my first try, but from what I've read here this won't do! I'd quite like an open top set-up, but don't know what to get, wattage wise. If I just stuck with the hood what wattage would I need and how would I adapt the existing hood to accomodate the lights? I read somewhere that for a tank under 20g, the light should be 2 - 3 wpg as opposed to the 1wpg for low light plants. However, if there were floating plants, wouldn't they shade out the immersed plants, therefore needing more lighting? Please help me, I'm utterly confused!!