A “blow-out” is a term betta breeders and hobbyists use to describe a small hole or tear in the fin tissue caused by spreading or “flaring” of the fins. Torn or frayed fins can be caused by a number of things including bacterial fin rot, injury from tank décor, biting from other fish or even from a betta nipping his own fins. The term blow-out is not used when holes or tearing … [Read more...] about Fin Blow Out