07-17-2010, 01:14 PM
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In my view the answer is a definite "no." Pearl Gourami are territorial, as is the Angelfish. They are too much "alike" and will see each other as "enemies." Please have a read of the profile of both fish on our site, you can go to profiles by clicking the second tab from the left in the blue bar at the top, or click on shaded names of the fish in posts.
Our profiles give info on tank size and suitable companions among other important things. On this I must mention that a 20g is not sufficient space for an angelfish. These fish grow to 6+ inches in length, and fish grow all their lives so they need adequate space from the start. Also, angels are shoaling fish, meaning they occur in groups. TO be healthy, they should be maintained either in a group (4 minimum, preferably more) or as a mated pair. A 20g is not sufficient size for either option.
Corydoras are also shoaling fish that should be in a group of 5, although 3 is the minimum. They have a social structure within their group, plus they feel "safe" the more there are. I would consider adding a couple more corys. The angelfish I suggest should be moved to a larger tank with companions, or perhaps the fish store will exchange it. Many reputable stores will, they know we all get ourselves into these predicaments. Sadly some stores don't help with useful accurate information either.