Nancy said:
There were reports last year from a vulgaris owner that his vulgaris had an aversion to yellow!
oh dear, that must have been a very awkward adjustment for the owner.
Seem's to me that the color blue remind's him of something bad or harmful, as their natural instinct they try to identify predator's and the sort, maybe he feel's threatened by it for some reason, this is highly peculiar, very strange indeed!
It might be wise not to conduct any more experiment's, don't want him feeling threatened by his own owner, I wonder if ceph's can get seizures,hehe. :P