Here are some links to articles about the nitrogen cycle (cycling). Read up on them so you'll know what your tank is going through.
Beginner FAQ: The Nitrogen Cycle
http://www.cichlid-forum.com/articles/cycling.php
The Nitrogen Cycle - Article at The Age of Aquariums - Tropical Fish
You will need a test kit, if you don't already have one. You will need tests for ammonia and nitrIte. Tests for nitrAtes and pH are also helpful. I recommend the Aquarium Pharmaceuticals Master test kit. Whatever you get, go with liquid tests, as they are more accurate.
Big Als Online sells this kit for $13.
I would test the water daily and try to keep the ammonia and nitrIte levels below 1ppm. That may mean doing daily water changes (be sure to dechlorinate), but it will give your fish a better chance of survival.
The cloud is most likely a bacterial bloom caused by adding too many fish at one time. It should go away on its own...especially if you are doing frequent water changes.
Don't vacuum the gravel during the cycle and don't change out the filter media...good bacteria are building up in them, so just leave them alone!
Also, do you know what type of red cichlids you have? Some red cichlids (Red Zebras, Red Devils, etc...) aren't meant for community tanks. If you don't know the name(s), can you post a picture? I would hate for you to have fish in the tank that you can't keep. Its best to ID them and find out if they are compatible before you get too attached.
Welcome to the site by the way!