sick pinktail trigger

[Pheonix_aust]

hi guys
ive got a prob with my pink tailed trigger he`s in a 160 gallon tank with other triggers and puffers. lately he has lost his colour and is rubbing up against rocks and gravel. im at a lose for what is wrong. there are no signs of fungus or parrasites

[Haydn24]

That can be a good sign of ich... I would remove it to a quarintine tank if possible and closely monitor.. Goodluck!