Help!!! Betta fish tail gone!!

[Angelfish owner]

My rose petal betta, solomon was found behind the heater with a part of his fin missing. He is kinda acting like he's paralyzed.

Nitrates 10 ppm
Nitrites 0 ppm
Ammonia. 0 ppm
Ph 7.00

Before and after

 

[fishingBuds]

Temperature? Are u adding chemicals to thw water? Is there a lot of movement outside the tank? What is the water flow strength on the surface?

My rose petal betta, solomon was found behind the heater with a part of his fin missing. He is kinda acting like he's paralyzed.

Nitrates 10 ppm
Nitrites 0 ppm
Ammonia. 0 ppm
Ph 7.00

Before and after

 

[Angelfish owner]

The temp in the tank is 80 degrees Fahrenheit. Outside the tank is generally low movement area. As for chemicals I use declorinator and beneficial bacteria. The flow is on the slowest setting. It's a hob because he got sucked up on a sponge filter. It's a 10 gallon with 3 Corys and a snail.

 

[Angelfish owner]

Update: he's staying near the surface and just sitting near his betta leaf

 

[Laser]

Was he stuck when you found him?

 

[Angelfish owner]

Yes, unfortunately he didn't make it through the night. Thanks for the help