I will take his water to be tested today!
I do partial water changes about every month and a half to two months and I do replace the entire filter cartridge. I thought I was supposed to? How should I replace it??
I'm afraid my fish, John Quincy Adams, is sick! He had a white spot on his fin when I first got him 9 months ago but it did not grow or change so I left it alone.
I've begun to notice that his tail looks like it might be deteriorating and some of his dark blue color is lightening.
He has...