Goby and Pistol pairing

I have one pair already who paired up right away, trying to do another pair in another tank but the YWG doesn't seem interested in pairing up. Pretty sure he's seen the shrimp, wondering if age/maturity comes into play with pairing. My other pair were both close to adult size at purchase, the new guys the pistol is about adult size but the YWG is barely over an inch.

Well looks like they finally hooked up, though it was the shrimp who found the goby I think he tunneled into where the goby had been staying. Little ******* found my pile of rubble last night I had for mounting frags its all gone.

He's a bit over 2"

My other pistol is a Randall's he just digs a little bit but has generally always stayed in the same area, this guy is a Tiger and alot more active he's excavated under every rock in the tank even a couple small stand alone rocks at the front of the tank. He's taken all my rubble, a bunch of empty hermit shells and even a halimedia plant. :laugh: Glad I didnt have any loose frags laying around everythings glued down.