They’re obsessed with each other they never leave each other’s side I just can’t believe it to be aggressionClean bucket - freshwater same temp as aquarium. Allow to swim up to 5 mins
Add general cure or ruby rally pro which is formalin based daily for 5-7 days.
as for breathing. . . add oxygen via airstone and check your ammonia and nitrate levels to assure theyre not high.
This happening overnite can and does happening. They also do this during pairing but this looks like a little more than a pairing issue