My poor little Reuben passed away this morning. I found out just the other day when I'm in the shower and my mum is using my brothers room to do her hair in (he has a very large full body mirror in there) he has been using my room to get dressed, spraying his hair products and antiperspirant. Maybe it was getting into Reub's water. My younger brother and I are heart broken, we buried the little fish in one of my mum's plant pots. Tearing down his tank was upsetting, I'm just getting over it now. I'm 23, little fish dying shouldn't upset me this much surely? Hating my other brother silently right now. Well I've put Reuben's filter in my big tank and banned any one from going near it. I want to try and keep it seeded so when the light goes off at night I'm switching Reub's filter on too, hope that helps. I don't think he had anything he could pass onto a crayfish, I don't think he died from a disease, He had fin rot issues and got over his bloating issue just a few days ago and was happily eating blood worms.