i had a trio of these at one time and i have never had 1 change yellow like that... odd for sure!
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printthread.php?t=19507&pp=40That's really neat! Just saw this topic so glad it got bumped!
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.