Two yellow watchman goby sharing a burrow

[Tink90]

Hello everyone,
I added two yellow watchman gobies at the same time recently in my 10 gallon. I was curious if anyone knows if I have a pair forming or is this normal behavior if they are sharing a burrow, they rarely leave the burrow or leave each other. Thanks in advance for your insight.

 

[blaxsun]

Dunno, but if they seem happy... (what happens in the burrow... stays in the burrow).