FYI, this PBT has been with me for more than 5 yeas now. I had another one for 3 years before and she died because of the power outage.
PBT needs to follow certain rules especially when you are making your selection at the LFS.
1)The body features need to be normal, meaning clear eyes, round abdominal area, fully attached and clear fins, normal coloration, active, readily accepting and digesting food also, shemust be alert by your presence. The breathing rate needs to be normal and is constantly patrolling the tank she is in. Also, she needs to be in the LFS for a period of time. DO NOT buy any new arrivals no matter how good she looks or how good the price offered, if the fish is not eating, then let it be.
2)You need to train it to accept flak food, which is highly nutritious. Offer food a few times a day. You also need to offer algae. Nori is a good supplement; do not offer them human vegetables. Most of the human vegetables contain too much water that will not help them sustain needed nutritions. Excessive moisture in the human vegetables will causing the fish defecates constantly. The only way to offer human consumed vegetables are those that are prepared with other ingredients with only fibers remained. Spirulina is a great staple for this fish and all other Tangs.
3)This fish needs high dissolved oxygen to thrive. This means for those of you who wants to keep this beautiful fish, you should either have a powerful skimmer and have high flow rate in your tank. This fish also needs ample space to live healthy, as crowded environment will only stress this fish because of constant aggression among tank mates.
4)Proper pH level is also extremely important. This fish is very sensitive to water parameter swing.
5)Temperature. You should have a good temperature monitor and controller. Temperature that deviates more then 2+ degrees will cause discomfort and ignite ich.
HTH!