What are some things I could do to encourage my Green Frog's immune response? (Rana Clamitans)


The tank is very clean I wash the glass with an iodine and water solution and change the water every day. His food is dusted with calcium. He really likes sunshine and I'd like to get some live plants when I get a bigger enclosure. That's all I've got so far. Happiness, cleanliness, supplements, sunshine and lots of alone time.


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I'm asking because I've only had him for a month, he came from outside and he was injured.
I want to do my best.

(Please don't reply just to say something depressing!)