Unsure If Platy Is Ill

Hey all. I have a 64L Fish Box (aka Fish Pod) with 4 male Platys, 8 neons and 3 shrimp. For a few days, I've noticed one Platy can be near the bottom of the tank in the corner. He isn't like this all day by any means and will come out and act normal - swim about, interact with his pals, feed and be cheeky with one or two of the other Platys, I just don't get why he does it at all. I can't sit watching the tank all day to know exactly how much he does it but I know he does it enough for me to notice. He isn't showing any physical signs of illness, he isn't lethargic or off his food and if I tap the glass near him he will swim away. I test the water regularly with API strips and ammonia kit and everything is great. I do a 20% water change once a week using Interpet Bio-active Tap Safe because of the great things it removes and adds to the water.

Any tips/advice please?

EDIT: beaten to it by 15seconds, but I'll leave this reply as is!

Male platies can get 'boisterous' and he may be bottom of the pecking order, and a 64litre tank doesn't give him much hiding space. The thing to watch out for with platies are clamped fins... that's a reasonably sure sign that he's unhappy. Plus platies can spit out their food rather than swallow it if they're unwell... so watch him eating really carefully for a while.

Do you have lots of decor and/or plants that will provide hiding places and broken lines of sight?

p.s. Welcome to the forum.

Livebearers are like that. If there are no females in the tank they'll try to mate with each other, or any other fish in the tank. It's quite normal for them.