bubble bar

I am fairly new to fish keeping and have had a 20 gal tank for a couple years. I just recently upgraded to a 29 gal tank and I have all guppies and 2 black mollies. I was considering getting an airstone but not sure what to get. I decided to try a 12” bubble bar but it has big bubbles & seems to...

So I got four (4) mollies several weeks ago and added them to my established tank. Cycled tank and no fighting, added some seachem stability and everything went well. My three females are all pregnant, and this leads to question one. 1. Will my male pestering the females hurt them at all or is...