I have a 2 inch pistol shrimp now in my 20gallon High. I'm looking for a goby that will beable to live in this set up for life. I will eventually upgrade, but that is potentially many years down the road. I love the Pink spot and the Yellow watchman, but I'm afraid they will get too big for a 20 gallon nano. What other options do I have that will fit and pair with my pistol?