Hi guys. I usually come here to lurk but have finally been brought to join after noticing my frog has a red, raw anus and it really worries me. He's an ACF kept in a 20 gallon (high) tank with snails and feeder guppies and nearing two years old. I do water changes at least bi-weekly and just did a big one about a week ago. Chems earlier were fine though I still need to check ammonia. I'm using a tetra whisper filter specifically for up to 20 gallons. Water temperature is 78F. I haven't noticed any other trauma. He's muscular and generally healthy looking and is swimming fine with no problems reaching the surface.

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I'm not sure if its the beginning of red leg or a fecal impaction/anal prolapse. He's fed repto min frog sticks and he eats guppies. I'm also wondering if the filter sand could be a problem.

I won't be able to rest well until I know he's ok so any help you could provide would be much appreciated. Thank you!