Sulfa meds can cause more bleeding to occur during treatment. Amprol/corid powder is what you may want to use first at 1 teaspoon per gal for 7 days, skip 21 days and then treat w/ Sulfadimethoxine at 1 once per 2 gallons for 5 days, skip 21 days then start again utilall birds are at least 5-6 months old/laying.(never use 2 sulfa drugs at same time, or for longer than indicated.)