29 Gallon Tank Urgent: Betta has grey spot around mouth, acting lethargic


Hi everyone, my betta has something grey around his mouth area and is acting far more lethargic than usual. The rest of the fish are fine.

here’s emergency template info:

What is the water volume of the tank? 29gal
How long has the tank been running? About two weeks
Does it have a filter? Yes
Does it have a heater? Yes
What is the water temperature? 78F
What is the entire stocking of this tank? (Please list all fish and inverts.)
1 betta fish
2 mystery snails
2 albino Cory catfish
2 peppered Cory catfish
2 panda Cory catfish
3 harlequin Rasboras

How often do you change the water? Weekly
How much of the water do you change? 25%
What do you use to treat your water? Seachem prime
Do you vacuum the substrate or just the water? Just the water but near the substrate as possible; it’s sand

*Parameters - Very Important
Did you cycle your tank before adding fish? Yes
What do you use to test the water? The API testing kit
What are your parameters? We need to know the exact numbers, not just “fine” or “safe”.

Ammonia: 0.25
Nitrite: 0
Nitrate: 20-40
pH: 7.0-7.4

How often do you feed your fish? Every other day for all else, betta daily
How much do you feed your fish?
betta gets two pellets
Catfish and snails get algae wafers and/or bottom feeder pellets (I alternate)
Harlequins get tropical flakes or some of bettas food
What brand of food do you feed your fish?
I use omega one betta buffet pellets, API bottom feeder sinking pellets, aqueon tropical flakes, and Tetra Pro pleco wafers.
Do you feed frozen or freeze-dried foods? No

Illness & Symptoms
How long have you had this fish? Since October 2019
How long ago did you first notice these symptoms? Today
In a few words, can you explain the symptoms? Grey splotch around mouth, lethargic, labored breathing, at bottom of tank
Have you started any treatment for the illness? No, not sure what it is
Was your fish physically ill or injured upon purchase? No
How has its behavior and appearance changed, if at all? Lethargic, grey splotch

Explain your emergency situation in detail.
I recently added new plants, new fish, and have started using Aqueon aquarium plant food. Every creature except the betta, the snails, and three of the catfish are the original fish from the 10gal I had set up two weeks ago. The betta has never acted like this and I don’t even have a guess for what he has or why. All I can think is that another fish was a carrier, but they’re all fine. EXCEPT, one harlequin Rasbora was pale when it came home and it died two days later. The rest of the fish are acting completely normal. The bettas mouth is usually completely dark. Please help in any way you can, I love him lots.

Edit: He was gone as of this morning. I don’t know what he had but it appeared so fast I don’t think I could have saved him. He had a white cast all over his body and his fins were browned and frayed at the ends.


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