long horn cow fish?

Yes, you can do a water change & you may want to run carbon to help filter toxins out, Lactorias can release toxins.

It really depends on tank size & the size of the cowfish......


Kaye
 
It needs to be a big water change... at least 50%. I'd use fresh carbon and keep an eye out. If any of the fish begin to seem lethargic (slow, clumsy) take them out of the tank.
 
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