07-12-2014, 09:27 PM
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What kind of cory? Some like water temps warmer while others like it fine there. Check and see if he's the warmer type. Stress damages the slime coat often resulting in this, so make sure he has his proper group of five, and proper substrate that isn't grating on him. Try adding a little stress coat+ to see if you can help him repair and fight off infection without meds.
The best treatment for finrot, usually, is actually clean water over meds unless it's serious(serious being...really falling apart and looking bad, swelling and redness with it etc). =) For now, try to get your nitrates under control with water changes. Use Prime, if you have it or can get it, to detoxify it when you do changes. That'll help a whole lot. With how high it is, give it a while, do smaller changes(maybe 30% per day after the initial larger 50% one...larger ones if it doesn't start settling down after three of those at least). See how it goes. If he doesn't start looking better after a few days -don't expect it to be gone just better - then use medicines. I wouldn't recommend melafix with them though, I'd go for one of the maracyn meds. One of them treats finrot, I an't remember which though.