Hi all - new to the group. Hoping for some thoughts. Treating our 12 wk. old sussex hens with Tetroxy HCA 280 for respiratory illness. Vet prescribed. Wondering if others have experience with this and how fast or effective it is. We have lost 4 of six hens and have one more with rattly sounds and another with no symptoms as of yet. Feeling desperate. Have used Vet RX, vitamins, electrolytes, etc. Vet was here today and said to keep them on the Tetroxy for 2 wks. Hoping it is not too late.