The Puffer Forum

This juvenile puffer of mine looks like it has a slime coat because his colors aren't as bright as they used to be. He has been hiding behind rocks lately but eats ok. Might be a skin disease? Treatment recommendation, or will he heal on his own?

75 gal
Three GSPs total
Canister filter
Water parameters are in the safe zone
Brackish 1.008 sg
79F water temp
Only have plastic plants

Parameters, please