Ok, relax. You don't have to do anything drastic.
First, you can do absolutely nothing and you'll find this is a self-correcting problem. You are NOT going to have dozens of babies in a community tank. No need to remove the nest or eggs or do anything at all - the other fish will take care of this problem for you inside a week.
Or, if you want to give raising babies a try, go on ahead and order some brine shrimp eggs and microworms. Move all the girls to another tank. Walmart has 10G ones for $13, they'll be fine without all their gravel and decor for a while, and you'll just move the filter over.
Don't mess with the 15G pulling decorations and stuff out, just leave it alone besides keeping it clean.
Feed the newly hatched babies on hardboiled egg yolk. That will do until your live foods get to you.
There is lots of info both here and on the web about raising babies.