I disagree, my lfs has a 3 gallon with a goby and pistol thats been up for a year with no i'll effects. Tank looks great and is full of healthy coral, so the water quality has to be good. Will it be easy to keep up the water quality? No but if you keep up with it, it should be fine. My deco is going to have the pistol shrimp goby combo as soon as my tank cycles.