Zebra Danio Not Eating/hovering Near Bottom Of Tank

[BenVic]

Hi,

I have a Zebra Danio in my tank which has been acting sick the past day and a half.

Its not eating, and its hovering near the bottom of the tank often, and seems to be breathing heavily.

Its color doesn't seem as Vibrant, although I haven't noticed any other symptoms. The fins, eyes, gills look ok as far as I can tell....

The PH is between 6.6 and 6.8. Amonia/nitrates are ok.
Edit: 10gallon tank
Edit: Tank hovers between 76f and 78f depending on if the lights are on.

I've had him for about 3.5 weeks with a buddy Danio. Unfortuantly the buddy got caught under a plant and after we freed him, he didn't swim properly and died that night. We also added 2 chinese algae eaters to the tank a week ago, and one died as well (I thought it was stress from the move) I haven't seen the other algae eater bullying the Danio.

Those are the only 2 fish left in the tank

I'm not sure what to do....if theres some bacteria / virus in the tank i'm not sure what I should get based off the symptoms he's displaying.... I don't think he's going to make it another couple days

I also tried adding a Black Molly before the algae eaters which died in a day around 2 weeks ago. I thought that might have been stress as well since every other part of the tank checked out....

Help!

 

[LauraFrog]

This is a bit of an odd case. Are you absolutely sure that the tank is cycled? As in, when you say the ammonia is okay, do you mean 'it's pretty low' or 'it's zero'?

How long has the tank been set up? What water are you putting in and what are you treating with? Danios are often used for cycling tanks, so even if it was a cycle spike I would not expect to see the danio that sick. In fact, if there was ammonia in the tank I would expect the danio to be uncomfortable and the algae eater to be dead or dying. Do you have results for nitrites?

How is the tank filtered?

Have any of the fish that have died shown any sign of white growths, slime or finrot (fins going black or white, shrinking, falling apart or developing holes)?

What I would suspect (given continuing deaths of hardy fish in a tank you say does not have an ammonia problem) is that there is either something in the water that is hurting the fish that your water treatment is not getting rid of, or that some kind of bacterial infection has gotten into the tank. Not sure though.