My little african dwarf frog (who I raised form a tadpole, along with 5 siblings) has been doing fine, behaving normally, eating, etc. there is a problem though. His front fin is slightly red, and I noticed that one of his "fingers" is missing!!! I keep watch over the frogs each day, ive noticed the redness for 2 days, and changed the filter/water accordingly. I've isolated the frog, put in some substrate and a tiny plant. Please help!

Here are some pics of the poor little guy: (problem is with his left arm)

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