I've just fitted a new light to the fishtank and it gets rather hot. I think I'll add a fan but space is very tight. Also it can't be 12v as I'd have to run a seperate cable etc. If I use a 230/240v fan then I can wire it to the light switch so it only runs when that's on (so no noise when I'm sleeping). Any ideas as to were I can get one? I've tried Maplin but they're too big (smallest is 3") and I'm looking on Ebuyer now but they don't always list the voltage.