this is magikarp, my red lionhead goldfish, he currently lives with 2 other red lionhead fish, a few days ago, he was extremely active and ended up stealing a lot of the other fishes food.
Ever since then, he has been hiding behind the decorations and moving a lit less, until today I noticed a white string coming from their anus, should I be worried? I've heard about feeding fish garlic or antibiotics.
-The tank is 10 gallons
- the other two fish are extremely lively and active
-I've had these fish for almost a week now