This afternoon I was going to monitor how were my 2 guys doing, as usual. And I found that one of them had passed away, his eyes turning vague and his colors turning brown like the soil surrounding him, in his natural planted tank.
For a few days, I've been noticing his lethargy act and little appetite, and his color loss. But his change of behavior lately was not dramatic. When I first bought the two guys, they are both very healthy, but one of them is less active and he is the one who passed away today.
I believed that he died of age. I don't think he had parasites as I have constantly changed his water with water conditioner and he has received the same treatment as the other betta who is now still kicking active.
Fishie. May you rest in piece and your soul lives in peaceful eternity. You were doing awesome and I have learned a lot because of you.