I got a new betta female 2 weeks ago, she has hardly eaten since I got her, she has been having long stringy white poo, and is losing weight. When I first added her to the tank she ate a few times, but it has now been at least 5 days since I have seen her eat. I added API general cure in case it is parasites, 3 days ago to the tank and redosed last night per instructions, but she still seems to be getting worse. 3 days ago I tried separating this female into a breeder box (with a moss ball and hiding cave) in hopes that I could convince her to eat without the competition from other fish (4 guppies, 1 siamese algae eater, 2 endlers, 1 other betta, and some guppy fry) but she completely ignored all the food (I tried omega one flakes, pellets, soaked freeze dried shrimp and soaked freeze dried bloodworms). Everyone else in the tank is acting normal and not seemingly ill, so I'm not sure what is going on with her. On Sunday before water change tank was 0, 0, and 20 for ammonia, nitrites, and nitrates respectively; pH was like 7.6 per liquid but strips always show it as acidic so idk which to believe. Tank wise, I change 25-35% of water weekly depending on nitrate levels, I dose aqueon "aquarium plant food" right after water changes, occasionally with a dose of seachem phosphorus (depending on green spot algae growth that week), and a 1/2 recommended dose of flourish excel every few days for the faster growing plants (though not since the last water change considering I'm medicating the tank and didn't want to add stress). As of this morning she looked markedly worse, and developed popeye, I moved her to a 5 gallon tank with a heater, erythromycin, nitrofurazone, and ball for hiding (which she isn't using). Currently she is sitting listless at the bottom of the tank. Does anyone have any idea what else I can do to help her? Is there another medication that I should try? Should I treat the 20g too? Attached is a pic of her yesterday.
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