Good. Id go 2.5 cc on the hens split in 2 doses. the toms 3-4cc split dose as well for 4-5 days and follow that with 5 days of tylan 50 in the water. 2cc per gallon. Tylan is nasty and bitter ( yes i found out the hard way lol) so make sure they only have once water source or they'll avoid it...
Get some tylan 50 and give it by injection sub-cue (under the skin) 4 days in a row. The water solubles dont really seem to work the greatest for actual treatment. How much does the little one weight?