My understanding is that Corid is not an antibiotic, it works on the cocci by inhibiting the absorption of B complex vitamins thus causing the death of the cocci by depravation. It should be fine to add the antibiotic and probably needed if the case is severe because the small intestine will be damaged and secondary infection can set up. I would recommend a broad based antibiotic such as penicillin. You can actually get this in tablets and not have to add to the water, most tablets come in 250 mg so you'll have to half or quarter depending on the size of the bird. Respiratory infections will probably need Tylan or Gallimycin, I used these in an alternating schedule on a year to year basis to combat resistance to the use of one antibiotic over time.
Also, turkeys are very susceptible to disease early in their life, I do not recommend putting them on the ground until they are at least 12 weeks old, wire bottom cages work best so as to keep them from walking in their own droppings which will help break the cycle of re-infection. They also do not handle inclement weather change well so keep them protected and dry during this time.
Hope all goes well.
Blessings,
Bo
