I bought 3 chromis last week. everything was great and they got along famously... for a week.
the other night one of them was separated from the school hanging out by a rock on the bottom. he looked just freaked out a lil so i said okay no biggie. next day hes still doing that and then i noticed hes having lots of trouble swimming. later on in the day he lost the ability to swim right and was blowing around with the current.. i felt terrible but didnt have the heart to flush him alive. came back home from a game and he was gone, i think my clean up crew devoured him.
okay, nothing i couldve done i figured. now however, another chromis is acting in the same way he was. he is still eating but is down in the bottom corner of the tank looking generaly freaked out. the other chromis doenst seem to like him anymore and will chase him away if he goes near.
i see a small strand of white trailing out of his butt, is this a tell tale sign? its barely noticeable but i am watching him carefully to see whats visibily wrong if anything. no ick spots, no noticeable loss of color, just the weird behavior so far.
should i freshwater dip, QT and antibiodic, or just watch and wait.