Hi. Another quick question. I'm not sure how corydoras normaly interact; I've heard they are "schoolers" to an extent, but I got 3 corydoras a week or so ago and they aren't doing quite what I expected. First of all, they are assorted varieties (one is albino, one is bronze longfin, and another is salt-and-pepper) and sizes (1-2 in). The guy at the LFS said that the different varieties would interact no problem, but here is what I'm seeing: every once in a while (like feeding time), they group together and dig around in formation, but most of the time, it seems like they are off patrolling the gravel on their own, only to regroup briefly and occasionally. Is this typical cory behavior, or should they be hanging out more?