Welcome to BYC. Sorry you didn’t get any answers earlier. I am only familiar with chickens, not quail, but I would either start some Corid for treatment of coccidiosis or take some droppings in to your local vet to test for coccidiosis and worms. Try a little plain yogurt or buttermilk fed to the quail until you get the Corid, and I would get it soon. You may also post on the quail forum here for more help—click on the blue box “post new thread” : https://www.backyardchickens.com/forums/quail.48/
Corid dosage is 2 tsp or 10 ml of the Corid liquid or 1 1/2 tsp of the powder per gallon of water for 5-7 days. Divide those by 4 to use a quart waterer.