Angelfish and Large Tetra

You need to test your water asap and find out what the ammonia, nitrate and nitrite readings are!
Ammonia and nitrite should be at 0 at all times and the nitrates less than 10ppm
If any of these are off then that's whats killing your fish.
What is your cleaning/maintenance schedule like? How often do you do water changes? How much do you change? How much and how often are you feeding?
It's VERY IMPORTANT that you provide these details as we can then be able to better assist you and figure out what's going on with your tank.
If you don't have a water test kit, your lfs or pet store should do free water testing for you.
I would recommend investing in a liquid master test kit by aquarium pharm. It will come in handy in emergency situations like this.
 
You might want to read the sticky on cycling a tank ;)

You've had the tank for two months.....if you put all those fish in at once, it probably hasn't really cycled. Best bet would be to do some major water changes every day/every other day and get some ammonia and nitrite test kits so you'll know when the cycle is set.
 
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