Poorly fish

[Theotheplec]

Hi I really need some advise my sailfin plec has dropsy I've tried treating him with melafix but he's getting worse This morning i found blood in the tank and what looks like his insides he's still alive but do u think I should put him outta his misery and if so whats the most humane way if there is one thanks murfi

[Marc van Arc]

Yes do so if there is no cure.
Most "humane" way: take a plastic bag with water from the tank, put the fish in, tie a knot and put it in the freezer.
Fish are coldblooded, so when the temperature drops (which is obvious in a freezer), the fish will quietly pass away.