EMERGENCY-My betta fish has badly frayed fins!!

[PureAwesome]

Recently I noticed that my fighter fish has badly frayed fins.
I do a 50% water change once a week and have a filtered and heated 9 Litre (about 2.5 gallon) tank.
Could this be fin rot, if so could you tell me how to fix it??
Thanks

[cjconcepcion]

it looks like tail biting, your filter is baffled right? just keep him in clean water, itll heal up eventually, if he lets it

[PureAwesome]

Sorry about the late reply but I posted this early in the morning and fell asleep.
I might sound a bit stupid but what is a baffled filter??
And will it heal by itself or do i need medications??

[cjconcepcion]

a baffle is... something that reduces the flow of the filter, does it create a current in your tank? does it push your betta around when he swims near it?
and you shouldnt need medications, maybe add another 25-50% water change within the week and it will be completely healed in a month

[PureAwesome]

Ok I will do that. And yes when he swims under it (it's a hang in filter) it pushes him a little bit

[cjconcepcion]

what kind of filter do you have? i might be able to help you out with it

[PureAwesome]

It is an Aqua One ClearView 75

[PureAwesome]

That model ^ is slightly bigger than mine

[cjconcepcion]

theres a sticky for how to baffle it at the top of the betta fish bowls and habitats section

[PureAwesome]

Alright I will have a look