I just looked into my 55 gallon tank a few minutes ago, and a male
Glowlight Tetra was chasing the biggest female. I wasn't sure what he was doing, but it looked similar to livebearers when they breed, so I googled it. They are spawning! Now all of them are at it!

My poor platys, and guppies are all hiding because the Glowlights are swimming all over the tank.
Last test was:
pH - 6
Ammonia - 0
Nitrites - 0
Nitrates - 30
Temperature right now is 78.
Unfortunately I don't know if I can keep any of them, because I only have a 3.5 gallon tank that I could put them in to raise them.

Unless I put them in my Betta tank, and chances are they'll get eaten in there... Well even if I don't get any babies I'm still really excited that they're all spawning on their own.