Well, I don't have too much experience with pipefish but my friend has some dragonfaces that are doing great in his reef tank, so speaking from what I've seen I'd say that the dragonfaces are your best bet (a local guy buys his tank-raised).
Also... about your bryopsis problem, have you considered a lettuce slug? I know that they're a confirmed bryopsis eater. Granted that they're not known for being that great in captivity, but it's also a viable solution to the bryopsis problem.
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