While it's possible that many types of fish may appear to get along, they are not compatible.
Goldfish and gouramis should not be housed in the same tank as their needs are different. Goldfish are best living with goldfish.
No. Gouramis will be very aggressive to the tetra.
Gouramis aren't really great fish to have together unless they have room to move around (e.g. at least 5 gallons per fish). Your tank is MUCH too small to have two gouramis, they're fighting for territory. If you don't want to return one to the fish store, then you should definitly just get a bigger tank. Unless you have dwarf gouramis, you should have them in at least 20 gallons. It also depends on what kind of gouramis you have. Some are more social and are more likely to school (dwarf gouramis, pearl gouramis) whereas others prefer to be top dog (opaline gouramis, blue gouramis). Good luck!
No, gouramis are egglayers.
no .................
The scientific name for a Dwarf Gourami is Colisa lalia.
Yes, gouramis have a labyrinth organ that allows them to breathe air in addition to extracting oxygen from water.
yes.
no. fish can only mate with fish of the same species. Gouramis mate with gouramis and platys mate with platys.
Not necessarily. A Betta is a "Labyrinth fish" but all Labyrinth fish are not Bettas. All the Gouramis are Labyrinth fish too.
Surprisenly I had 2 male betta in the same 150 gal tank with other fish and had no problems. Other fish included gouramis,tetras,angels,cory cats
Gouramis come in a large number of colors. You can not determine their sex based on their color.
I have a blue gourami with my gold