20 Gallon Tank Sickly Danio

LeBreevee

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So, its been at least 5 months since I have added anything new to my tank. My last addition was 2 horned snails, one that died off quickly.

Last week one of my remaining 4 cory cats was lying on its side gasping for air. At first it could right itself but eventually it grew weak, and I did the kindest thing I could do and euthanize it. There was no sign of disease, but I don’t know if it was wild caught or not and other details. I had it for about a year when it passed.

Now I have one of my remaining 4 pearl danios that looks really bad He hasnt been eating much, has a lump in his abdomen, and his back is a little curved. He tries to eat but spits it right back up. Im a little worried it might be fish TB but no other fish has shown any signs, and I know the other danios pick on him.

The rest of my 20g tank with a 30g filter is fine.

I have 2 upsidedown catfish, 3 leopardus cories (sold to me as false julis, I had more but one died to a fungal infection and one died by giving itself internal bleeding running into the side of the tank) and 3 other danios aside from the sick one.

Only other fish is my albino bristlenose pleco, full grown.

I have a single horned snail.

The water parameters are fine, and ive been treating with flourish Excel for BBA

The only thing about my water is it is very hard, but its always been that way.

I typically do a 25% water change every 2 weeks unless I change filter media, then I let it run an extra week and then do a 35% water change.

Here is a pic of the fish.

Should I euthanize it? What do you think is wrong?
 

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  • Thread Starter
  • #5
Why do you change the filter media?

Because its a carbon filter cartridge that builds up a lot of brown algae, I put the new media in with the old though for 24 hours before swapping them. Its to add new carbon.
Theres a chance its pregnant before you bough it
I bought it 8 months ago I think it would be obvious by now.
 
Well...i think you should probably do a water change every week and increase the percentage closer to half the tank. Wouldn't be surprised if that has played a hand in a couple deaths, though not a definite thing. Your danio almost looks like maybe bloated or a tumor. Have you seen it pooping lately?
 

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  • Thread Starter
  • #7
Well...i think you should probably do a water change every week and increase the percentage closer to half the tank. Wouldn't be surprised if that has played a hand in a couple deaths, though not a definite thing. Your danio almost looks like maybe bloated or a tumor. Have you seen it pooping lately?

The reason I reduced water changes to biweekly is because I was seeing that more deaths or illnesses seemed to occur if I changed it once a week. Mostly because I wasnt giving beneficial bacteria enough time to grow. I make sure to test the water parameters weekly so it wasn’t an ammonia spike. I have not seen the little dude deficate, but again, I haven't seen him swallow food either.
 
The reason I reduced water changes to biweekly is because I was seeing that more deaths or illnesses seemed to occur if I changed it once a week. Mostly because I wasnt giving beneficial bacteria enough time to grow. I make sure to test the water parameters weekly so it wasn’t an ammonia spike. I have not seen the little dude deficate, but again, I haven't seen him swallow food either.
Well, that makes sense about the water changes i suppose. At least the reasoning is understandable!

How long has he not ate?
 
  • Thread Starter
  • #9
Well, that makes sense about the water changes i suppose. At least the reasoning is understandable!

How long has he not ate?
Ive honestly only noticed him regurgitating his food the last two days. I don’t know how long he has been doing that though. I was so focused on the sideways cory that I only noticed the danio was sick after the cory passed.
 
This might be "microsporidiosis" . Please google.

Several assumptions made aren't entirely correct to me. Frequent waterchanges don't mess up with beneficial bacteria and a filrern doesn't cause brown algae.
 
  • Thread Starter
  • #11
This might be "microsporidiosis" . Please google.

Several assumptions made aren't entirely correct to me. Frequent waterchanges don't mess up with beneficial bacteria and a filrern doesn't cause brown algae.
Ill look it up. He isn’t looking any better but he hasnt gotten any worse. The only thing concerning me is he appears to be pooping solely mucus. No sign of a parasite. Ive gone back to weekly water changes at 33%. I just had a bunch of inverts die on me when I changed the water too frequently. They were ghost shrimp though and those kinda die for no apparent reason since they were supposed to be feeders. They all passed away though over a span of a year. The tank is overall healthier now that I am changing the water more oftenx
This might be "microsporidiosis" . Please google.

Several assumptions made aren't entirely correct to me. Frequent waterchanges don't mess up with beneficial bacteria and a filrern doesn't cause brown algae.
The only thing I can say that is odd is none of the other fish show any symptoms so it does not appear to be contagious, as this was a progressive issue.
Ill look it up. He isn’t looking any better but he hasnt gotten any worse. The only thing concerning me is he appears to be pooping solely mucus. No sign of a parasite. Ive gone back to weekly water changes at 33%. I just had a bunch of inverts die on me when I changed the water too frequently. They were ghost shrimp though and those kinda die for no apparent reason since they were supposed to be feeders. They all passed away though over a span of a year. The tank is overall healthier now that I am changing the water more oftenx

The only thing I can say that is odd is none of the other fish show any symptoms so it does not appear to be contagious, as this was a progressive issue.
I guess my question is at this point would the best thing be to cull the poor creature? It looks emaciated and poor in health and it seems to be struggling more and more every day.
 

Random Great Topic!

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