butterfly breathing only with one gill

[buraccha]

hi everyone,

It's been 2 weeks that i bought a auriga butterfly for my fish only system to control aiptasia population.

its not unusual but, 2 days later i see him breathing with both gills and some with only the right or left one.

I see no sign of stress like scratching, heavy breathing or color loss.
he is eating well and he wiped out my aiptasia problem (only the big ones are left).

however, i dont know if its normal that the part of his gill is darker than his normal color for a auriga that is white.
is flukes or parasitic infection? cause i dont see nothing on him and doing great

thank you for the read

 

[ThRoewer]

I've had that with several puffer fish (Tetraodon nigroviridis). Back then my assumption was gill flukes but I could never confirm that. Speaking against that was that several of them I had at different times did it.

 

[buraccha]

but is your puffer got something a few days later or he always got it?
and did he die after or its was nothing?

 

[ThRoewer]

They never had any other problems. Usually they switched sides to breathe with once in a while. I think to remember that this stopped after I got them transitioned to full salinity.

 

[buraccha]

what is full salinity specific gravity?

 

[ThRoewer]

On average 1.025 kg/l

1.022 - 1.026 kg/l for open oceans (Atlantic & Indo-Pacific
1.026 - 1.028 kg/l for the Red Sea, Persian Golf and Mediterranean Sea

Salinity Distribution at the Ocean Surface