Originally Posted by BalaGuppieGirl
So after reading all that you posted, I would suggest letting your tank cycle before adding fish. I have been excited in the past and jumped the gun before as well. You need to let your tank run at least a week with no fish to get all the good bacteria in and let your start up chemicals balance the water out of things such as chlorine and metals that are found in tap water.
Fish are almost guaranteed to die adding them only 3 hours after set up just because of water conditions.
What kind of fish do you want to have?
Cycling the tank is extremely important. It takes much longer than a week to cycle a tank (takes 3-6 weeks), unless you are referring to using bottled bacteria, in which case you would not want to let it run for that week without fish. In any event, it doesn't seem like a fishless cycle is a possibility because there are already fish in the tank.
You do not have to wait for water conditioner to "work" before adding fish. Water conditioners work on contact. The fish will not die in 3 hours after setting up the tank just because of the water conditions, assuming water conditioner is used.