Hello, My chickens: Approximately 75 adult layers, 150 pullets/cockerels, and 100 chicks (isolated, indoors). They are completely free to roam my property and fed a diet of brewers grains and occasionally cracked corn and oyster shell. They get all of the grass, grit, and bugs they desire. The problem: We started noticing bubbles in the eyes of a few birds and some that will not open their eyes at all. Combs on some are pale. We have noticed this in the past but the chickens seemed to just get over it before we could diagnose the issue. Now that it has happened again, and we think we know the reason we tried to treat it early. Ultimately we figured it was MG/MS, and started a cycle of Tetracycline Hydrochloride. About 5 days into treatment we started to notice worms in the stool. and one who had a visible worm in the eye. The question: We don't want to stop the antibiotics mid-cycle and it could still be MG/MS. Is it safe to worm the birds while treating with Tetracycline? What is the best way to worm a large flock? Is there a water soluble wormer that can be added to their drinking water? Orally administering ivermectin to 225 birds just doesn't seem feasible. Thanks in advance.