On a night my Congo Tetras swim on a funny angle then when I turn the light on in the morning they swim normal again ? Does' anyone know why this is ? Also I think they are trying to mate and wondered how I can spot the eggs?
Many fish 'sleep' nose down or at an unusual angle when resting after lights out. If they were like it with the lights on, I'd then start to worry
Not sure where congo tetra spawn I'm afraid so can't help on the second bit.