40g cube stocking assistance

[SexyKillerWhale]

Hey everyone! Looking for options for my last potential fish buddy for my 40g cube.

Current inhabitants are:

2x Black ice Clownfish
1x Six Line Wrasse
1x Benggai Cardinal
1x Diamond Goby

3x Peppermint Shrimp
12x Snails

3x Softy Corals

Thank you all in advance!

 

[SexyKillerWhale]

Bump

 

[123]

Maybe a royal gramma

 

[PeterB113]

Dragon pipe fish.

 

[Andreas' Reef]

Firefish but it might not go over well with the six line. Can we see pics of the tank??