Juwel Vision 180 - Could I Add?

[guineapigqueen]

I currently have in the tank:

11 X-Ray Tetra
7 African Glass Catfish
3 Congo Tetra
2 Clown Loach
2 3 Spot Gourami
1 Banded Gourami
1 Rainbow Shark
1 Bristlenose Plec

I was considering adding 3 female congo tetra, will this be ok?

Emma x