Freaking out a little bit. My clown out of nowhere is breathing rapidly and staying at the bottom of tank. First two photos are of the clown of concern, I’ve had him in my tank for 4+ months now no issues, I attached photo of my other two clowns and they are completely un phased. All levels, salinity, pH, NI NA, phosphates; etc all perfect. I know he’s clearly struggling with O2 but I have more than enough oxygen flow through my tank. Flukes maybe?! Prepping to fresh water dip him here shortly, any advice or other opinions on his current state before I do so?? Thanks so much!!!!