I have 3 chicks around 4 wks that have had a rusty/yellow diarrhea they were on Sulfa/Trimeth and then switched over to Albon. They've been on one med or the other for about a week. Two have gotten better and one not so much. She's not getting worse but also not much better. Is this med not working or does it just take time? She's very lethargic, always trying to snuggle with the others as they play. Is this the wrong antibiotic? Is there one that treats all strains? Please help.