Tapeworms are not an emergency, and if they have them, you should see them again. The Valbazen is probably the best wormer to use routinely for the other common worms—roundworms, cecal, capillary or thread worms, and gapeworms, and I would use it. I shared mine with another chicken owner since it goes so far. It settles, so shake it well. You may need it later. A fecal float by a vet would tell you exactly what worm eggs are being seen.