Fully Developed 20Gal (Open Suggestions)

Here Below is my fully developed 20Gal tank
Parameters
Ph 7.4
GH 6
Ammonia 0
Nitrite 0
Nitrate - 0
 
Fish inhabitants
4 Albino Corydoras Catfish ( 2 Adult Female, 2 Juvinile(think Males)
1 F.Julie Cordoras Catfish ( Fake Julie, Male )
2 BlackSkirt Tetras
 
 
Any other Fish Suggestions would be Appreciated  
 

More Black Skirt tetras?

Yep, you need to bump up the numbers of all your current stocking.
 
The cories and tetras are all shoaling species so groups of at least 6-8 of each would work better.
 
However, a suggestion, rehoming that single cory, think you mean false julii perhaps, then bumping up the albinos to perhaps 8 would be a start.
 
Black skirts can be a bit of a nippy specie so would avoid long finned fish specie if youre considering adding another specie to the tank.
 
Just an observation here, i see in your pic the tank water is kind of low, how come?

my water is low because i took the pics before i added the extra water to it. I had to bump my water level up due to my plant being a grower( abit bigger than my tank as it stands ).
 
Yet for the BlackSkirts, i kinda wanna swap them out. any suggestions ( Also i had added 1 Amano Shrimp, seems to be doing good as he hasnt died from my high ph levels. Also my F.Julie had died...... Sad but the Red gills it had seems to have taken its toll after 5 months ))

Sorry if I've asked you this before in chat and forgot. Is your water soft or hard? Btw, why not unpot those plants?
 
Perhaps cardinal tetras? They may seem a bit common but they're quite pretty and colorful.

because they kinda got stuck in the pots, due to some snails jamming themselfs in the pots.....
 
Cardinels are nice, but i dont think they would be good in a High Ph water..
 
My water is a GH of 4 right now, im keeping the dead snail shells in the tank to kinda help with Upping my GH