Betta Tail Rot ID

[Stef]

Is this tail rot?  He’s a half moon. I’ve had him almost 2 yrs. The upper section of his tail looks a little torn. No ragged pieces hanging off. I have several seriyu stone pieces and live plants. No sharp spider wood or other artificial decorations. He’s in a 10 gal with only a single oto. He’s eating and swimming normally. 

Per master test kit this morning:
Ammonia: 0

Nitrite: 0

Nitrate: 0

I can’t seem to get any nitrates. I have a ton of frogbit

pH: 7.6

Edited August 1, 2021 by Stef
Adding water parameters

[Colu]

The light edges to his fins could be the start of fin rot I would increase water changes and monitor for now if it's gets worse I would treat with maracyn

[Stef]

Thanks @Colu  do you mean increase volume of water change or increase frequency?  I usually go every two weeks at 50% for this tank. 

[Colu]

I would do 50% a week for a couple of weeks

[CalmedByFish]

Would the purpose of extra water changes be to remove bacteria from the water column?

[Colu]

On 8/1/2021 at 7:44 PM, CalmedByFish said:

Would the purpose of extra water changes be to remove bacteria from the water column?

It to lower the bacterial count to help seed up the healing process