Hi guys, I recently aquired a 54litre/ 14 gallon ( for americans). So i wanted to do a little tropical set up. Im used to temperate/ coldwater and have a temperate 300 litre currently set up and running well. The previous owner had given me 6 very young female guppies to put in it along with some of their original tank water. They are doing fine so far, no issues. But i was wondering if there was anything else i could put in there to add a bit of color. It is not a rectangle tank, it is cube in shape. So im unsure if that matters stocking wise.