How Many Cories Is Ideal

[bikerfish]

Hi All
I have an 180lt tank but long, it is 38 inches and 15 inch wide , I have a external fluval306 filter ,substate on bottom , tank 2 years old , any way I have 6 skunk cories and 6 albino cories and loving them
Question is how many cories would be ideal in my size tank ? I would love to up 2 more of each for a bigger shoal but not sure if over doing this ?
I also have 3 keyholes, 5 guppies , 3 blackwidows , 1 spottedheadstander and bertie my brn so pretty stocked
Cathy

 

[SombreroBanana]

6+ is ideal, so you're already there.