OKay! This week the proof came through:
Crystal Spring is recessive to Crystal Sea:
I mated my crystal spring boy (Durin) with Reven's crystal sea girl (Kari) and they produced a girl showing crystal sea (Shannon). In fact they produced a number of boxes all showing crystal sea but anyway it took this long to get a result.
Shannon finally popped a baby bengal that shows the crystal spring coming out from under the crystal sea when paired with the recessive-eyed Chancellor who shows jade.