If this helps anyone determine the behavior seen in the clip, I have an update. Sadly, the two that turn yellow, ended up damaging the other one. I thought it was just part of a mating so left it alone, but the two, at some point in the night, chased the other one out of my tank to its death . I thought I had the tank well sealed, but it must have jumped out a small hole needed for the filter.
If this helps anyone determine the behavior seen in the clip, I have an update. Sadly, the two that turn yellow, ended up damaging the other one. I thought it was just part of a mating so left it alone, but the two, at some point in the night, chased the other one out of my tank to its death . I thought I had the tank well sealed, but it must have jumped out a small hole needed for the filter.
So sorry to hear this!! The video was very neat! Looked like a couple of males facing off. Perhaps he was just trying to find a place to go since he wasnot welcome in the other males territory?