I like the tank very much!
Don't know that I would agree with fish selections.
You have mixture of fish that don't share similar water requirement's which often times leads to stress = sickly fish.
The Gourami prefer soft warm water 78 to 82
degrees F, while the danios prefer cool hard water 76 degrees F being the upper limit's. Paradise Fish
and Gourami may not get along for long ,both being territorial but 55 gal may offer enough room.
Tin foil barb's get very large, (12 inches) and prefer to be in groups of five +.
Tetra's prefer cool, slightly acidic water as opposed to hard water, and they too do best in groups for it gives them a source of comfort with other's of their species present.
A couple different species of Upside Down Catfish
, some stay small, (4inches) and the other's grow to around six or seven inches if memory serves me. Chinese Algae Eater
's oddly enough ,aren't from china and as they grow larger,,they lose interest in algae eating, and turn their attention's to nipping,chasing,other fishes = stress = sickly fishes.
Things could be fine for a few weeks, months,just suggesting some things that you may wish to consider.