Betta tail paralized

[J_acon]

Guys i don't know what is wrong with my betta, but his tail is like all curled up and he can't move it. The tail is 100% tense but totally the opposite from when flaring, instead of the whole tail opening it is totally close up. my Betta looks like a pen now. What can i do? All other bettas are fine. Water is fine too, had a water change on sunday. thanks in advance

 

[tekknocolor]

When you say curled up, do you mean clamped or really curled up like a curl?

 

[rykitten]

Is it possible for you to post a picture?

 

[J_acon]

He got clamped fins.

 

[Wisperian]

by clamped do you mean like its ooo clamed the tail seems like one line?

 

[once i was a maggot]

thats happened to 3 of my bettas, one of my crowntails had it but i treated with multi cure an all was good then recently, a veiltail and my other crown got it. the veils is more severe but its tail sticks together an looks like a long thin needle now an they r both sad an hardly flare any more