Corid will treat Coccidiosis but not worms.
Can you i.d. the worms you see? Valbazen and Safeguard will both treat most worms that chickens have except for Tapeworms.
To expand on @cherrynberry post - the dosing is correct, but how to give it is left out.
Safeguard dose is 0.23ml per pound of weight given orally for 5 days in a row.
Valbazen dose is 0.08ml per pound of weight given orally once, then repeated in 10 days.
As mentioned earlier, birds drink more in hot weather so their poop can be quite loose and watery - couple that with watery treats (melon, cucumber, etc.) it looks pretty normal.
Eating well, active, etc. is good. Watching behavior is always a good idea.
Your feed and treats look fine.
