maybe this is something that happens in a lot of tanks, but we are so excited about this little pairing. we’ve tried to re pair our hifin goby with another hifin (after a gorilla crab killed it’s original first friend) & shrimp and failed so we found another tiny candy cane pistol shrimp & said, let’s see what happens.. we now have 2 candy cane pistol shrimp & one hifin all happy in one burrow now. the bigger of the two shrimp are more adventurous because it’s been in the tank for months with the hifin, but this was so exciting to see them all pair up almost instantly & be happy! cheers to new burrows.