Hi Welcome to the forum

I don't know about Gourami's but I know a little about ADF's
What size tank is he in? If it's the 5g, I'm not sure there's room for both.
They do best when their tanks are between 12-18".
Although they're fully aquatic they need to get to the top to breath air. If the tank is too tall they could tire out before getting to the top.
ADF's are slow to find food so if he's with other fish you'll have to make sure he's eating. This might mean hand feeding him with a turkey baster or very dull tweezers.
They're escape artists. Make sure there are any little openings he can squeeze out of.
The eat Frog and Tadpole bites, thawed frozen blood worms and
brine shrimp.
Feed just until their belly looks full.
Over feeding can cause bloating.
Avoid freeze dried food and flakes for the same reason.
They like the temp to be between 76-80F
Avoid using small gravel that can fit in their mouth.
Don't put them with large fish or they might get eaten or too small fish as the fish might get eaten.
I love the little guys, they're so much fun! If you click on the link in my sig I think I have pics of mine there.
Hope that helped.
Good luck.