Ill Leopard frog; PLEASE help!

[limnologist]

Take about a teaspoon of aquarium salt to every 2 cups of water.

treat the community tank like an aquarium, it also wont harm anything if you went longer without any kind of change.

you can keep him in the main tank, just make sure the wound doesnt get infected.

[Lovino]

20-50% change each week should do? I clean my aquarium about every 2 weeks- 1 1/2 weeks, but i have an under gravel filter, a top filter, and live plants in my aquarium. My frogs, have fake plants, and Im getting the filter thing worked out atm. Im trying to get a small one working in it, i just need to find the little carbon sheet things for it.

Im more aquarium person, as I said frogs are completely new to me. I really want to get to know about them, Like I know fish.

Also, How will I know when hes ok to go back in? How will I know his fungus/bacteria/illness or w/e is gone? I know that organisms can seem fine, but still be contagious and/or not feel well. What should I look for to know when to reintroduce him? I dont want to make mr.chives sick too!

(btw my frogs are mr.chives and mr.sage, sage is the ill one)