Here are a few link I found about tetracycline and sulmet:
https://www.backyardchickens.com/t/393291/dosage-for-duramycin-tetracycline
https://www.backyardchickens.com/t/275031/tetracycline
https://www.backyardchickens.com/t/621720/tetracycline-in-water-when-can-i-eat-eggs-again
https://www.backyardchickens.com/t/683354/sulmet
http://www.drugs.com/vet/sulmet-drinking-water-solution-12-5.html
https://www.backyardchickens.com/t/393291/dosage-for-duramycin-tetracycline
https://www.backyardchickens.com/t/275031/tetracycline
https://www.backyardchickens.com/t/621720/tetracycline-in-water-when-can-i-eat-eggs-again
https://www.backyardchickens.com/t/683354/sulmet
http://www.drugs.com/vet/sulmet-drinking-water-solution-12-5.html