they were definitely fighting ,they were like that for around 30 min
that pic was taken a few years ago i still have them in the tank together
they never did it again
Consider locking jaws as arm wrestling-not real fight. Usually, once they determine who is stronger, they follow the rule. They kill each other by biting each other in a chase until one is too stress out. The most aggressive fight I have seen is to suffocate the other one by kind of like swallowing the opponent (not like locking jaws-one lip on each side.)