Holy crap!
You're a mess!
1 blue Gourami - 6" adult size. It needs a 29 g minimum so you really can't have alot in there with it!
1 pike cichlid - are you talking about the North American pike? Either way, this chichlid has got to go!
4 cherry barbs - the only four fish that ares happy ATM (unless the pike decides against that

)
2 flying foxes "might get rid of them" - good idea
2 clown loaches - at 11" adult size, no brainers
1 red-tail shark - could work....
You're 20 gallon long could use improvement.
1 gold angel - babies (like quarter size) like to be in schools of 6+ fish. Even as adults, they prefer at least one companion
6 black neon tetras - looking fine
1 yo-yo loach - yoyos are schooling fish. They will need 2 - 5 more companions to prevent overstressing.
You really have you're work cut out for you... I suggest list all the fish you 100% want to keep and trade in the rest.