Glad they are looking better today, that's good news! Recovery times can vary depending on the strain(s) of coccidia and how much they had inside them and how much damage to the digestive tract. If they're slow, do the full 7 days and then assess whether you need to do the second week at the lower dose. Corid is very safe, no worries about that. Since they are looking better then it's having an effect, so they should continue to improve. Glad you started treatment in time. Once you have finished treatment you can do vitamins then, if needed. You can give probiotics after also, that will help get their guts back in balance.