that picture I found online - it's not my tank! They seem like fun fish. These don't seem aggressive - but they are small. Online it says they can be come aggressive if they are not in a substantial group. I only have 3 small ones. I bet as they get older they will get more daring.
I like them - but ultimately doesn't seem like they belong in my tank - back to the drawing board with getting more fish! I love all the bottom feeders - and so I try hard to like and be interested in the upper level fish - harder for me - and these fish go everywhere - that is one reason I like them - they are interesting - but I think they must go back! to bad:(