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It's not good to end an antibiotic early, and sulmet is that. It most definitely is part of the problem, but not all. The start of it was that the birds had to be treated in the first place. That was an indication that their good bacteria weren't established enough to fight the cocci. It sounds like the environment is quite clean.
So the sulmet, in treating cocci, killed good bacteria. That's why any time any medication (even amprolium in coccidiocide strength) is given, probiotics should be given. Any stress upsets the bacterial colonies of the gut. Especiallly because these birds aren't hen-raised (as most of ours are similarly not hen raised) and thus didn't get the nature-intended innoculation of beneficial bacteria from their moms.
In any case, probiotics should help. Sulmet shoud be continued as labeled without one day less. Probiotics every day during sulmet, then every other day for two weeks after as the birds are reviewed to see if they remain cocci free.
If we could roll back time, Corid would probably be the best choice. But it sounds like her feedstores, like mine, don't carry it. That's a shame, but doesn't surprise me. I wish they all carried it.
By the way - to the chicks' mom - good on the yogurt! that's a good sign. Just give them a bit. It's not an exact science, but I'd give no more than a teaspoon each - probably less. It won't kill them to have more, but they're not as lactose tolerant as we are.