I recently had a 10 gallon tank with 4 platy. Yes, I know, I had 3 males and one female, which isn't good. However, all my males were very peaceful, didn't harass the female or each other at all. It was the female that was a character! She chased and harassed all the others continuously, though they were much faster than her, and seemed to enjoy the chase as they'd go right back near her and have her chase them again, doing loops and swimming in and out of plants and a log.
I was able to keep my PH steady and everything was testing proper.
My platy, all four, died the other day due to water issues. My water has never been great, but with boiling, then leaving the water out for several days before a partial change, using the water conditioner, etc, all was well. However, after doing everything I always did, the water killed my fish within 2 hours of a partial change. My husband keeps telling me they died for a cause as we've since found out that my tap water has been making us and my rabbits ill as well. We have complaints in to the EPA and Health Dept and hope that it will be straightened out soon. I, however, do not trust my water in the future with my fish. I live in a mobile home park, and they very often shut the water off for repairs to an old system, and put us under boil orders. I need to find out if I can use bottled water for my next tank? I remember years ago I used to use drinking water for them. However, I was told by one pet shop that it wasn't good for them. Can I use drinking water? Bottled spring water?
I want another set of platy so badly. I work the night shift, and sometimes have trouble sleeping in the days. I put them near my bed and I'm able to fall asleep because it's so relaxing watching them swim and play. My last set of 4 I had for about a year. I'm heartbroken... I feel terrible that I killed them with my water. If I'd only known then...