Zebra Danio - Swim Bladder Disease?

[Rbz5416]

64l tank is approx 2 months into maturity & contains 9 Danios & 3 Guppies. Ammonia & nitrite are fully controlled by an oversize filter (Fluval U2) & nitrate by weekly partial water changes (25-30%). All specimens appear healthy except for one Danio that has spent the last 2-3 days unable to maintain buoyancy, tending to lie at the bottom of the tank & occasionally flit around at high speed with little apparent control. I was fully expecting it to die shortly after noticing the symptoms but they seem to be getting no better or worse.

Managed to net it & have a close look through a magnifying glass & apart from a very slight fading, it appears in good condition with no fin damage, spots or anything else.

Any suggestions?

 

[KISSfn]

How did you cycle your filter? What are your exact Ammonia and Nitrite readings in mg/l?

 

[Rbz5416]

How did you cycle your filter? What are your exact Ammonia and Nitrite readings in mg/l?

Cycle was with a few leopard danios as I couldn't get hold of ammonia anywhere. The zebras & guppies were added only after both ammonia & nitrite were at zero, as confirmed by my own & the store's testing.

Academic now as the fish died overnight.

 

[KISSfn]

Sorry for your loss... Reading your post I thought of one of my Danios that acted the same and suffered the same fate.

 

[Rbz5416]

Sorry for your loss... Reading your post I thought of one of my Danios that acted the same and suffered the same fate.

Thanks.

Because it had gone on for a few days without degenerating further, I hoped it may be something the fish could fight off itself. I left it isolated in the net, suspended over the top of the tank so it was at least free from the attentions of the others & looked no worse last night but dead this morning. Wishing I'd gone with my original instincts of euthanisia now...

 

[KISSfn]

Unfortunately some fish go from sick to gone no matter what and sometimes very quickly. I had a Serpae Tetra that appeared to be dying and I considered euthanisia. Instead I put him in my hospital tank and he made a complete recovery. From then on I've always given my patients a stay in my hospital to see if they can be saved. Highly recommend having a hospital tank. I have a patient in mine now and after 5 days of treatment he has recovered and will be returned to my main tank today!