Yes I did think age may be an issue - I think these barbs must be a couple of years old and none of my fish are older than a year. However in their previous, smaller tank they were with a youngish molly and 2 tetras (which I also added to my tank - and they have settled perfectly) as well as 4 or 5 much larger catfish and plecs (like 15-20cm jobbies as opposed to my teeny 2-5cm) - and the previous owners said they have always been very peaceful. I would have thought they could be okay at least with my other fish as aside from my guppies none of them have long fins/tails which seem to be the biggest issue. But I would only consider swapping them with my guppies if I knew they wouldn't hurt my other fish - how big of a risk would you say? Of course I will not be keeping them long in that small tank as it is really not adequate for them (they are very active and playful now - I think they must have just felt very overwhelmed and exposed before!)
