Male Platy Chaos!

[buildingaqua]

I had a single male platy in my 10 gallon planted tank for a while, and I just recently introduced 4 new male platies to fill out the tank. I did this to avoid any offspring as I wouldn't have nearly enough room for them in the 10 gallon, so I heard getting only male platies could be a good alternative. I learned pretty quickly that the first platy I had in the tank is now a huge bully to all the other new ones that are smaller, and even when I remove him, the other 4 still fight a little amongst themselves. This has been going on for almost a week now, and I don't know what else I can do. They don't seem to have any fin or body damage, and all of them seem to be eating enough during feeding, so I was wondering if anyone could provide some tips on what I could do about this or maybe just some relevant advice, because for all I know it could just be a natural thing with male platies. 

Videos: https://streamable.com/0absvm, https://streamable.com/bhxp6o, https://streamable.com/2zpu5r

(In the videos, the big orange one with the long black dorsal fin is the original platy I had. The first link is a video where I took him out and the other 4 platies fought anyway.)

Edited April 17 by buildingaqua

[GoofyGarra]

Yup this is completely normal. Male platies will fight to assert their dominance over each other.

Provide plenty of line of sight blocks so they cant see one another, be sure to provide hiding spots so they can escape bullying when needed.

However, there is no really good way to avoid the bullying. My best success has been with many more females then males, but this introduces the possibility of fry which i understand you are trying to avoid.

[johnnyxxl]

Take the fish out rearrange the decorations and make lots of hiding spots then reintroduce the fish all at the same time.  This will help cut down on some of the violence.

[Tony s]

I had an all-male platy tank for almost a year. 20g no females. plus one male betta. there was a bit of aggression, but non-life threatening. everybody made it through the year. it was an attempt at population control. the females and fry were in the other 20g. unfortunately population control was not an option, as the females kept having fry for several months. so, after a year everybody is back int the same tank. still not much aggression. but some of the older ones have passed after 2+ years. the tank has now stabilized at around 30 platys. all sizes. all ages.

I think the takeaway. yeah, you'll probably have some aggression. but not enough to cause a serious issue