Thanks - can anyone reply to my questions above? 
Also, I can see you have a heater guard, i really need one of these as i'm a bit worried about my fish getting burnt!.. any idea if I can just buy the guard alone? Although, it's probably not worht it as I can buy both heater + guard for about £7... is a 50w heater ideal for that size tank?
Also, I can see you have a heater guard, i really need one of these as i'm a bit worried about my fish getting burnt!.. any idea if I can just buy the guard alone? Although, it's probably not worht it as I can buy both heater + guard for about £7... is a 50w heater ideal for that size tank?