The problem with the mysis test at an LFS is that the net pen raised seahorses coming out of Asia are trained to eat frozen mysis and are labelled CB or TR (because technically they are bred in a tank and raised in captivity), but they have all of the disease and parasite problems of wild caught seahorses, and need to be treated as such before they can be put in your aquarium. Most seahorses coming into the LFS right now are net pen raised. While all SH at the LFS should be consider suspect without the name of the breeder, the species you should especially avoid at the LFS right now are Kuda and Kelloggi, as those seem to be entirely net pen raised at the moment and people aren't having very good success with them long term. I would also avoid breviceps, which I have seen coming in recently. They are a temperate species needing much lower temperatures than what they are being kept at by the wholesalers and most LFS.