Hey guys new to this forum and thought I'd ask the experts for some advice.
I've had my betta mr grumpy for around 10 months now and for the last few weeks he's had a growth on his back.
His feeding and activity hasn't changed and heres a bit about his home;
20 gal (uk) with 12 Chilli rasboras and two assassin snails
Planted (with some algae issues)
NitrAtes 5 ppm
I've attached some pictures for you to see, any advice would be grateful he has recently had a treatment of maracyn plus