Rainbowfish fighting?

[FishFriend0]

Hello,
I was looking at my rainbowfish this evening and saw that one of them had a patch of scales missing. Upon further inspection of the other fish I saw that another rainbow had a tattered looking fin. There are I believe 3 males and 3 females which I know is not an ideal ratio (it's ~230l) but I haven't added any more females because I have had some disease problems with my livebearers and although things seem to be getting better over the last couple of months with no one seeming to be sick I am still hesitant to add any more fish. If I am honest, I am about ready to give up on livebearers from a while as I have been having issues ever since I started keeping them around 2 years ago and am hoping to get some more species of rainbowfish once later down the line.
Anyways, it has been this ratio for the entire time I have had them (around 2 years) and while they do sometimes scuffle, I have not seen any injuries until now. Both of the affected individuals are acting completely normal and don't seem to be in any distress so I am hoping this was just a one off. I was just looking for a little advice on if this is due to fighting or if it could be injury due to hardscape. I will attach pictures of the injuries.

 

[GaryE]

I just stopped keeping rainbowfish after many years. Usually, with 3 males in a tank, things are peaceful, but quite often you need 5 to eliminate serious fighting. On occasion, as the generations of these easily bred fish roll along, you get males who tolerate no others, and would rather fight than eat. It's a low percentage, but when one appears, he lets you know he's there.

They can be aggressive fish sometimes, within their own groups.

 

[FishFriend0]

I just stopped keeping rainbowfish after many years. Usually, with 3 males in a tank, things are peaceful, but quite often you need 5 to eliminate serious fighting. On occasion, as the generations of these easily bred fish roll along, you get males who tolerate no others, and would rather fight than eat. It's a low percentage, but when one appears, he lets you know he's there.

They can be aggressive fish sometimes, within their own groups.

Yes, they haven’t had issues in the past so I will keep an eye on them for now and make sure the injury is healing ok, thanks for the advice