Beta carotine is what does it. You can get the same results (cheaper)
by raising crickets and gut loading them with grated carrot.

Paprika does it too. Get carrots or paprika in your fish *somehow*
and they'll color up. The reds are mostly affected. Paprika also
turns (red factor) canaries red.


Sweet, I figured it was one of those chemicals on the side of the label.
I'll try that cricket dealy soon and let you know how it turns out.


Sean