QT Tank Breathing Issue

[kmbyrnes]

I have 2 Tangs and a Rusty Angel in a fully cycled 40b QT. All the fish have been through TTM and are 3 weeks into observation post TTM and 2 rounds of Prazi-pro.
Yesterday I did a 50% water change. Today the tangs are breathing heavily and staying near the bottom of the tank. They are also hanging together, which is not normal. So far everyone is eating.
Just did another 25% change, added an air pump and moved a PH to increase surface agitation.

No change in breathing and I am getting concerned.
Any recommendations on what is wrong and further treatment?

Water Params:
Temp: 77
Ammonia:0
Nitrite:0
Nitrate: 0

[snorvich]

Did you do a formalin dip?

[kmbyrnes]

No, But I Certainly will. Thanks!

[krullshards]

A very similar thing happened with me after dosing prazi. My hospital tank water got cloudy too which seemed like a bacterial bloom. I read that prazi will cause bacterial blooms and you need to aerate heavily while treating with it.

I added a powerhead with an airline and fully opened it. Within several hours the fish were back to normal.

[kmbyrnes]

I did the dip and as noted above increased the circulation and aeration.
All the fish look better this AM and are eating like pigs.
I hate using chemicals other than Prazi when I don't know what I am facing, that's why I ask here first.
Thanks again everyone.

[bonjorno2]

Glad they are doing better!