UPDATE time!
Petsmart was having a sale so I got 3 $1 platies. Since adding them the behavior of my multis and calvus has changed dramatically. They are out a lot more. The multis are still skittish but they don't dart back into their shells anymore they just hover near the opening. The platies are not there forever just for now. Once breeding starts they will most likely be moved.
They also have another tankmate. A very small electric blue hap I got for $1. What a hap with multis?? I know I know, just growing him out and he will be removed long before the multis are bite size. For now he is very very shy and after looking online a bit I believe he's been hormoned
I just hope he ends up being male. Time will tell. ANYWAY here are pictures.
And don't worry nothing else is going in this tank
It's stocked.