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Originally Posted by cheeks69 A 30 gal tank is way too SMALL for 3 Tangs ! They need room to move and keeping them in tight quarters like you are is going to lead to aggression, stress, disease, and stunted growth. It's possible that it was an inflicted injury or a bacterial infection. What are you using for filtration ? If given proper water parameters it should heal if not then you will need a QT and treat him with an antibiotic. |
Ditto.
Even if your water parameteres are perfect that size tank just isn't large enough to house a single tang let alone three.
I would suggest seperating the tangs at the very least before doing any treatments.