Judging by the size of the fish and equipment they have, they have been cared for in the past but they were abandoned with a house mate who had no idea what to do with them. I will keep the thread updated with their progress. Hopefully my students will become very well practiced in maintaining water quality.. are there any safe gloves recommended for working with these fish? I have a tank divided I can use but it would be good to be able to use gloves too.sure thing, those are some good looking piranha, you don't see them that size often. Good luck with them!