Here is some good info on Chytrid: Chytrid Fungus « Amphibian Ark. Lamisil is medication of choice in frogs. Have no idea if fish fungal medications (Pimafix, etc.) will work. Do know some human fungal meds can affect the liver; so would not take chances using them in my frogs.

And this one on Red Leg: How to Care for a Sick Frog with Red Leg Disease: 8 Steps. Red Leg is caused by stress and poor husbandry; so first part of treatment is to eliminate stress source and correct husbandry problem. Antibiotics are prescribed; but a member recently cured his red leg sick frog by using salt water baths. Although I do not agree with letting frog alone without meds; this article does have good points in reducing frog's stress: www.froggie.info - Redleg. Hope this helps you !