Tail biter?

[PheonixKingZ]

I don't think its tail biting, as it is on his bottom fins. Do as @Colin_T says.

 

[Salty&Onion]

I don't think its tail biting, as it is on his bottom fins. Do as @Colin_T says.

I will, I'll be going to my lfs today to get some aquarium salt, but what if they don't have it?...

Anyway, I did a water change in his tank and noticed some red colour on his tail, what is it? What is wrong with my little boi?

 

[Salty&Onion]

All his fins are clamped and it looks like the dorsal and left pectoral fin have white on them. The fish also appears to have a bit of excess mucous over its body.

This could be from something in the water irritating the fish, or a fungal infection.

Have you checked the water quality for ammonia, nitrite and nitrate?

Wipe the inside of the glass down.
Do a big water change and gravel clean the substrate.
Clean the filter if it hasn't been done in the last 2 weeks.

Add 1-2 heaped tablespoons of salt for every 20 litres of water. Keep salt in there for 2 weeks.

A little update, I have added 1 heaped tablespoon and a half to his tank (his tank is 30L) and cleaned his filter