Groups of their own kinds. The fish will feel safer.
White dot???? Like salt? If so check out this article
Freshwater Ich? Yuck! - Aquarium Advice
If they have ich then that would be (at least one reason why they are behaving poorly.
There is an additional article about some good to know solid basics in my signature link - worth a read.
In regards to whether the fish will have babies, it is VERY likely if they were in mixed sex tank. It is what they do. There will be a darker color in the lower abdomen next to where they poop, the fish will get blocky and very fat looking before birth.
When you do a partial water change /pwc
, make sure that the water is the tiniest amount warmer than your tank water, can help avoid Ich is stressed out fish.
Get a liquid test kit, read the linked articles from my signature about keeping fish in an uncycled tank.
Keep up with water changes because you have fish and no beneficial bacteria atm to process waste.
Do you know what the ammonia level is?