alright, so bubbles the dwarf gourami laying on his side bottom of his tank, never approaches bottom except for when in his jar cave but hes not in there and really is right outside

tank params are amo: 0, nitrite; 0, trate; 8
water's clear
diet hasnt changed, filters been working lately, light on normal amount of time
everything normal
temps maybe a degree or two colder than normal but that wouldnt do anything

his stomach is swelled up... again.
this happened before but it cleared up, everyone thought he was just maybe constipated
but its back, and its back suddenly
and well yes, laying on his side, gasping
not even moving his feelers

im going to lose him. i know this. there cant be a way he'll survive i dont think
i still want to know what this is though
please help
i'm moving him to a shallow hospital tank i made specifically for the gouramis right now so that hes closer to the surface if he needs air
and yeah

help