No one is going to step up? Alright, I'll carefully tackle this one without seeming to want to bust your bubble.
The yellow rics are actually severely bleached and if taken care of will turn green or orange within 4-6 months or so. If they are not well taken care of they will die. You may notice that the bub bles of the yellows are never as expanded as your greens, for example. Likewise, they never fully blow up. All sings of bleaching and the resulting loss of zooanthellae.
be sure to pay special attention to feeding them to allow them to recover.