Hello everyone, my two year old betta has lived in a 20 gal long with a snail for the past five months, happy as could be. Well probably around the beginning of February to late January his fins began to turn black on the edges, mainly on his tail fin. I know that could be a sign of rot so I began to do water changes every day for a week or so but nothing changed. I decided maybe he was getting old so his fins were just aging. Well the more I look at him the harder it is for me to tell if it's gotten worse. It has taken such a long time to progress to where I just blamed age. Now I'm not so sure. He's also blind in one eye so I have to scoop him out of the tank in a smaller, clear container with low water level to feed him because he tires out really easy. He is also a half-moon. For the past two weeks I've had 0 Ammonia, 0 Nitrite, and 0-5 Nitrate. I also added in some live plants last week, dosing Flourish once a week.