Your tank is only 55 liters or 14.5 gallons ?
Too small for a Molly or an Angel.
Angelfish need tall tanks. Their fins can get 12" top to bottom or more.
A 29g tank is about minimal size to grow out a nice Angel.
Mollies are very active, can hit 3" and are quite big eaters and poopers for their size. I prefer 30g for most Mollies, esp Sailfins.
So 110 Liter tank would be the size to consider for an Angel. As long as it's tall enough. 24" at least.
Sadly the Gourami needs room to grow as well. http://animal-world.com/encyclo/fres...ghtGourami.php
You are usually buying younger, juvenile fish. Please research the adult size and tank size needed before buying. It will save you a lot of time and heartbreak.