I recently just added a pistol and ywg to my 20 gallon reef tank for the sole purpose of having them pair. The pistol shrimp is about 1.5x the size of the goby if I had to guess and I'm worried that might make pairing difficult. I forgot what species the shrimp is but I am hoping its not one of the species that don't typically pair after learning that was a thing. It is grey with two black spots on the tail. Ywg sits in the same burrow as the shrimp but they don't seem to pay any attention to each other. Just looking for a bit of reassurance that I'm not stuck with a shrimp that will make pairing impossible.