What I have in My Discus Tank

Now I have 16 Discus fish in my tank. Its a bare bottom glass tank ( 33 x 18x 18 ). Here's what I have,

3 Pigeon Blood Discus pairs ( I'm bit worried about them, They are not growing fast like others )
2 Powder Blue Discus pairs
2 Snake skin Blue Discus pairs
1 Turquoise Blue Discus pair

I bought them when they were like 4 c.m and Now they are more than twice of the size they were.
My camera is broken so far i haven't able to get any photos of them.