The long and short of it is that my Mbu (in a 120L tank) has recently contracted white spot, my LFS advised me to use two thirds stated dosage of WS3 every 24 hours, but the day after the first dosage he gained more spots, i've now done just under full dosage today but i was informed that some medical treatment such as WS3 can lead to a lack of oxygen in the water according to people on another site. Is this true? Just to be sure of it i have added a water stone to the tank to help increase the oxygen levels and directed to output slow of water from my internal filter to get as much surface agetation as possible. Could the lack of oxygen explain the reason why he is breathing so fast and hovering near the top of the tank?