Water testing! If the tank is newly established I'd test for ammonia. nitrites and nitrates every day for the first coupla weeks. How long have you had it up n running with all the fish now?
Did you do a fishless cycle? Or use the product called Cycle? Not quite sure. If you used the product, know its useless
IMHO, and will likely do nothing. Consequently, you're in for a lot of water changes and a lot of ammonia and nitrite problems. If you already cycled the tank, and added the fish in steps, that shouldn't be as much of a prob. If you used Bio-Spira, the tank is probably cycled as I type, but you still need to water test regularly.
Do know tho, your tank is kinda overstocked. Not sure what a Fire Gromie is (a gourami? If so, is it a dwarf? Never heard of a Fire one), but the clowns will top out around a foot long, and the African Ghost (I'm assuming you mean a knifefish) will likely top out over 2 feet long and will eat any fish it can fit in his mouth, which means most of the tetras.
Lastly, the cory needs some buddies! Corys are schoolers, and a minimum of 3 is really needed for them to be happy, although more is obviously better. I'd return the knifefish, and pick up 5 more corys. As for the clowns, you have about a year or so before they'll need more room (they won't be a foot long yet, but with good care may reach 5-6 inches or so and will need a lot more room to swim).
