Tiger pistol shrimp

i have one tiger pistol shrimp in a 90 gallon tank! he teamed up with a 3 inch yellow watchman goby!
if i got another pistol shrimp and another yellow watchman goby would i have any problems between them? and is there a chance i could get either to breed?
i also have 80 pounds of live rock, 2 clown fish a pink bubble tip and a bunch of snails and hermit crabs

any help?

 

I believe that there may be some fighting, but I'm not totally positive. Shrimp gobies can be aggressive to each other if not a mated pair. I'm not sure how the shrimp would interact. You are probably going to want 20-30 more pounds of rock in that tank. Get base rock though. Its much cheaper.

 

unless they were like super far apart i wonder if that would work if not they will fight. ha if you do get that going if they will get confused and trade off shrimp