I would check the medicated food treats camallanous worms.
Has the whitespot gone as I don't think medicated food works on external parasites.
Gel-Tek Ultra Cure PX
Ultra Cure PX is a revolutionary way to treat internal parasites in both freshwater and saltwater fish. With metronidazole and praziquantel, Ultra Cure PX helps control a variety of parasites such as intestinal worms, nematodes, tapeworms, flagellates, fish heartworms, and hexamita. Innovative Gel-Teknology directly treats infected fish and helps prevent secondary infections, which can often occur during periods of infestations. Ultra Cure PX contains fish pheromones to entice and enhance feeding behavior without clouding the aquarium water. Ultra Cure PX is safe for all saltwater and freshwater fish and especially useful with catfish, cichlids, goldfish, and other bottom feeders.
Active Ingredients:
Praziquantel 0.0057%
Flubenol 0.03%
Metronidazole 0.30%
Directions for Use: Hold back all feeding for 1 day before using. Then use Ultra Cure PX as the only product offered to the fish when fed. Add to the aquarium with the dropper tip on the bottle. Hold bottle 2 inches above water surface and squeeze. Offer at least 5 drops per fish twice a day. Repeat every 24 hours for 3 days. For nocturnal fish, add drops when light is off at night.