Whats going on....

[justinl]

haaarrrsh. Well I would do exactly what Canadian suggested if i were you. There are also a few wrasses out there that eat zoa eating nudis. For the record, nudibranchs are very very specific predators so I wouldn't be surprised if the nudis are showing preference of one colour of zoos to the other; they'll probably move on to the others once they finish their favourite colony though.