Hey, I have 7 glowlights and at first they all seemed to schoal together. Now there are 2 distinct groups. The groups are sorted by the size though. To elaborate, the three biggest seem to stick together and the four that are a little smaller do the same. They will pass each other and do not disturb each other and occasionally they will all move around together, especially during feeding, but this just seemed odd to me and I really like it when they are all together in a group (it looks so cool that way). Any thoughts?
