Hello Betta forum...
I just got a veil-tail betta (bright red, very pretty). He is in a nice tank (3 gal), with some aquarium salt, adequate hiding spaces, a heater, filter, no pokey parts...I tried to do my homework before I got him.
So, when we got him he had a little black at the edge of his tail. Since then, the black seems to be spreading a bit, and has clear parts rimmed with black on the tail.
My question: is this fin rot? And if it is, is it my tank making him sick, or is it possibly from the pet store water, and will it get better as my aquarium?
Thanks in advance!