Vincent,
Thanks for your reply. I have just bought a fan, but it seems quite noisy....I guess I have no choice but to live with it.
Also, you are right about the evaporation. It is very quick. BTW, what do you use to top up? Just normal tap water? I was told the best is to top up with distilled water, since the water evaporated is also distilled. According to the fish shop, this way will reduce the growth of unsightly algae since less unwanted mineral from the tap water is introduced into the tank.
Do you or anyone knows where to buy distilled water?
Thanks,
Patrick