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Those are some healthy looking and beautiful yumas. In my experience the best precaution to take is to make sure that the yumas you're buying didn't just come in and they've had a little bit of time to settle in and make sure that the mouths aren't gaping when considering a purchase. If it looks questionable, leave it. Also, if you see any at the store spitting out brown goo, it could be digested food or it could be a bacterial infection. I know this will sound ridiculous but give it a sniff test, if it smells like rotting garbage or low tide at the pier pass on it as its likely dying from the inside out. I once bought a Yuma the day it came in and it was indeed sick with a bacterial infection and it wound up wiping out half of my 30 polyp colony. I've read about some people quarantining with Cipro but I've never tried it myself.
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