As Rocketseason posted - QT
You know, a lot of folks have been thru this when starting out. I got burned too. Got real excited, wanting to add fish too quickly. The system didn't develop necessary bacteria fast enuf to support the bio-load I was adding so quickly. On top of that, I gave up the QT
I had established and relied on the LFS
recommendation that the UV
sterilizer would keep me out of trouble.
All that said, I'm hoping you are QTing and trying real hard to keep the enthusiasm about adding too fast in check. Otherwise, there may be problems and things will die.
I was told the same thing about patience. But did I listen???
Sometimes that kind of experience is the best teacher.
Best of luck to you.