Has anyone had experience with Silver Tip Tetras? I've found very little information on them. Some resources explain that they are wonderful for a community tank while others seem to suggest that they are quite aggressive towards other fish of similar size and often bully on one member of the school (though a few of these accounts mentioned only having 2 or 3 fish... do you think a small school is the issue? Because if I got them I would get 11... So, what do you think?) Thanks so much in advance for any and all information.