just got this little guy 2day, n hes been kinda hiding n stuff, which i expected, but hes eaten a couple of worms.now over the past couple hours or so, hes gotlike furrystuff over his mouth

maybe fungus?ive put melafix in. when i went in the kitchen where his tank is bout 20 mins ago, he was just kindo hovering at the topof the tank, nwhen i loked properly his mouth looked completely covered with it

i caught him, n gently tried 2 wipe it off his mouth with a cotton bud, cos i guess that could suffocate him coulnt it? buthes no better

just sat on the bottom of the tank, nd his belly looks really dark now

is there something i can do for him?
pH - 8
amm - 0
nitrite - 0
nitrate - less than 5
15g tank, just him and a few shrimps n snails