Hello. I'm new to the forum and have a very sick Betta as of this morning. I have been searching the internet for information on what could be wrong and finally found this thread that seems to describe what I have going on.
I have had my betta since Sept. 2011 (so 8 months now) and he is in a 10 gallon aquarium with a sponge filter and live plants. I do weekly water changes of approximately 30%. I test my water monthly with the API liquid test kit and last month (as always) my readings were: ammonia-0; nitrite-0; and nitrate-5. He has never had a health issue and always had bright color and been very active. He is fed New Life Spectrum Betta Pellets (4 in the am and 3 in the evening).
Last night when I fed him at 8:00 pm, he was fine and this morning when I turned on his light at 11:00 am, this is how he looked. He has a large gray area across his back, on both sides, and into his tail fin. He will barely swim and his eyes are sunken.
I haven't been able to read this whole thread yet but am going to go back and read it right now. I just wanted to go ahead an post this in case someone might be able to offer some quick advice. Although from what I have read so far, the outlook is not good.