not always.. I had BTA's split on me all the time, it doesn't neccessarily mean it's stress related. They also split as means of sexual reproduction which would be a good thing..
Either way, given you have good water paramaters, etc, etc... the clone will heal up and do just fine. I've had many BTA's split on me in my 20g and all healed and thrived in my tank.
FWIW
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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