Lol, no wonder we couldn't figure out, those long fins weren't showing up in the pictures. It says they can get to 6" long, how big is your tank?
nevermind, I see its 20g. The skirt tetra only picks on others when its not in a school. They like having at least 4 others of their same breed and color. The gourami is a semi-agressive, so rehoming is probably best.
Yeah, the first thing I am going to be doing is taking the whole tank apart, getting ride of the horrible neon gravel, adding a good substrate and aquascaping it with live plants, rocks, a proper filter, and lights. Then I will start getting the Emperor Tetra a couple friends, and the Black Skirt tetras a couple females. Then it is finding the goldfish and the Guorami new homes and finally adding some fancy guppies and corys.