ComputerMan,
Please try to stick to one thread per topic... It can only help you, and us!
http://www.aquariacentral.com/forums/showthread.php?t=124157&page=2
He is cycling a tank, and has all of these fish in a 10G tank...
"What do I need to do?"
1st, Monitor your water 2-3 times a day to ensure that you maintain your ammonia and nitrIte toxicity readings well
below 0.25ppm. Angels in particular do not do well in a cycling tank, and even this may be pushing it.
2nd, return some fish if at all possible.
3rd, stop getting new fish to replace the ones you loose/return
4th, you really need to provide the answer to the questions everyone keeps asking you:
Water readings - What were they when you discovered the dead guppy? How are they currently? How often do you test (The toxins can easily spike to 4, 5, or even 6x what they currently read in 8-12 hours time especially given the amount of fish present), etc.
...and properly responding to the advice being provided and act upon it (I can only say we have the fish's best interests in mind, not necessarily yours sorry

)
EDIT: Sorry for being so direct, but I'm getting frustrated in seeing the same questions being asked, and the results predicted by many of us come to fruition a day ro two later...