my friend has just dug up her old 15ltr tank, i am going to help her set it back up, i have already suggested that a betta could go in there...but when she came round the other day she sed she liked the look of the guppies i have, could a few of them be kept in a tank that size and if so how many(males only)??? and of corse i dont mean with the betta, i mean insted of it....