I have a female blue gourami that's been skinny for almost a year now. She is atleast HALF the size of my other 2 females. I've treated the tank for parasites before and there is no change. She gets plenty of food. Diet is varied as well. Bloodworms, beef heart, plankton, brine shrimp, krill, veggies and flakes. I make absolutely sure she does get enough to eat. She is quite submissive compared to the 2 other girls. The male pays very little attention to her.
I've heard gourami's are prone to(or at least sometimes get) hole in the head disease, and also wasting diseases.
It could be parasites and you may need a different med, or she could be stressed from other fish even if they're not acting aggressively towards him.
If you can, I'd move her to his own tank, feed her extra food, or just feed her small amounts a couple times per day. If she stays skinny and doesn't gain, and still eats, it's likely parasites. The way she looks does seem to be a nasty wasting disease, or parasites since you say she gets enough to eat but gains nothing. If she's had them that long and no others have been affected, it's less likely parasites, but still a possibility. Also possible something toxic hit her if she has a weaker system or was sick prior, so it's only affecting her.
TB and Hexamita are also a possibility. Less likely if there aren't any other issues aside from skinniness.
Can we get water parameters, tank size and tankmates, any medications used in the last two months or so as well? Any stringy or white poo?
I had a gourami that looked like this last year. Treated for parasites and bacterial infections...didn't do anything for him though. =( Just being skinny with nothing else is likely parasites, just need to find a med that works.
She has remained this size for almost a year. Never gotten bigger nor smaller. She poos perfectly normal. She doesn't have HOTH disease. Hexamita is also quite similar to HOTH, which she doesn't have symptoms of. I'd think, if it were any of these severe illnesses, she'd show more symptoms than being skinny by now. Especially since it's been almost a year.
She eats plenty, I'll feed on the right side of the tank and she'll stay on the left side for the other half of the food that gets offered.
I've almost contemplated if it is possible males can stay immature when there is another male present. She was purchased with my original batch of blue gouramis. 1 matured into a male and he was also same body type as the one at question before he matured.
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