Hi welcome to FishLore!
I'm sorry your betta is worrying you.
If you could fill out the emergency template, it will help get all the questions in one post
Tank
What is the water volume of the tank? 5 gallons
How long has the tank been running? 2.5months
Does it have a filter? Yes
Does it have a
heater? Yes
What is the water temperature? 80°f
What is the entire stocking of this tank? (Please list all fish and inverts.)
One male betta
Maintenance
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? Prepared water, add
quickstart and stresscoat+
Do you vacuum the substrate or just the water? Vacuum substrate (gravel)
*Parameters - Very Important
Did you cycle your tank before adding fish? I’m learning I did not.
What do you use to
test the water?
Tetra 6 in 1 strips
What are your parameters? We need to know the exact numbers, not just “fine” or “safe”.
Ammonia: 0
Nitrite: 0
Nitrate: 0
pH: 8.4
Feeding
How often do you feed your fish? 6 days, 2X day
How much do you feed your fish? 2 pieces per feeding
What brand of food do you feed your fish? Tetra Betta 3-in-1 Select-a-food
Do you feed frozen? No
Do you feed
freeze-dried foods? Yes
Illness & Symptoms
How long have you had this fish? June 25th 2023
How long ago did you first notice these symptoms? A month ago
In a few words, can you explain the symptoms? Looks like fin rot
Have you started any treatment for the illness?
Maracyn Oxy
Was your fish physically ill or injured upon purchase? No
How has its behavior and appearance changed, if at all? Losing fin tissue, lethargic
Explain your emergency situation in detail.
(Please give a clear explanation of what is going on, include details from the beginning of the illness leading up to now)
Started with lethargy, not reacting to feedings, laying on bottom of tank, fins started to get shorter and rough looking a month ago.
Pictures showing progression of fin deterioration
June 28. August 10. Today