Lyretail Anthias breathing at the surface

spookisfat

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I have 4 female lyretail anthias and a valentini puffer in qt and one of the anthias has been spending a lot of time at the surface to breathe over the last few days. I'm looking for some advice on likely causes and treatment.

Background:
The fish all arrived from Live Aquaria on Friday 3/22 and were put into a cycled fallow 29 gallon qt (holding ~15-20 gallons). All fish behaved/appeared completely normal until Sunday 3/31, I noticed the one anthias spending a lot of time at the surface. The next day (4/1) I started treating the tank with paraguard. I have had success with it in the past with mystery ailments on new fish and the fish seem to tolerate it well so I opted for this as a first step.

On 4/3 I did a freshwater dip (for just the one fish) which the fish seemed to respond well to. It seemed to be a bit improved the rest of the evening and the next day (4/4-yesterday). Today it seems worse yet. Still breathing at the surface a lot but acting a bit more lethargic and also spending some time just laying on the bottom. It also did not eat for the first time at the last feeding a couple hours ago. The other fish also seem to harass it more than each other.

None of the fish show ANY visible symptoms of disease or parasites. I have not seen a single ich spot, or lesion, or scratch, or anything. I realize that many parasites affect the gills first without visible symptoms but it's kind of surprising to see nothing at all for 2 weeks now. I also realize that visible symptoms also could take a bit longer than that to present.

I'm trying to keep this short, but other things to note... The bio-load was a bit too high for the tank at first and ammonia did start to creep up but I kept it under control with prime and frequent water changes. It has been reading 0 for several days now. I really don't think this is ammonia burn because I feel like I kept it well under control and have had paraguard in the water for a few days now, but I guess I can't completely rule it out. The fish does seem to continue to decline even as ammonia in the water has no longer been an issue.

I haven't been able to get any of the anthias to eat anything other than chopped up shrimp (human-grade seafood), but they eat it very enthusiastically. I've tried a wide range of quality frozen foods, but they just don't have any interest so far.

I would appreciate any insights on likely culprits and best course of action. If it is some disease or parasite I expect it will eventually spread to the other fish. One of the three others has also spent a bit of time breathing at the surface but not nearly to the extent of this first one. I have a number of medications on hand and the equipment to set up additional temporary tanks if needed. Thanks in advance. Sorry about the wall of text.
 
A couple of photos. It actually sticks its mouth out of the water and kind of gulps at the surface.

20190401_225344a.jpg

20190401_225319.jpg
 
The anthia could have developed some ammonia burn during transit from LA, or even before they got it. First thing I'd do is a 30 minute bath in methylene blue. Then observe. Next step if no improvement is to check for flukes with a Freshwater dip.
 
The anthia could have developed some ammonia burn during transit from LA, or even before they got it. First thing I'd do is a 30 minute bath in methylene blue. Then observe. Next step if no improvement is to check for flukes with a Freshwater dip.

I’m curious about enough gas exchange with just one bubbler. I don’t see anything else breaking the surface of the water. I would add a powerhead and see if that helps.
 
Thanks for the replies. I didn't even think about ammonia burn carrying over from transit. Hopefully she will start showing some improvement soon if that's the case. I already did a freshwater dip a couple days ago and didn't see any evidence of flukes.

I just added a powerhead for better surface agitation. The surface does stay pretty calm with just the one bubbler but it is fairly powerful so I figured it was pumping enough oxygen into the water to be enough. Thanks for the suggestion. Hopefully it helps!
 

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