Why the sandy substrate?Do you mean court jester goby? They have nice color to them but require a sandy substrate
A strict number of fish doesn't make sense. 4 Trimma gobies is a wee bit different than 4 sailfin tangs. An extreme example to make a point. Also, territory and behavior are key to stocking.
I only have kept one of these fish. See avatar. It is one of my favorites. It sits with half his body out of a hole, then jumps out and eats algae, then backs into his hole. This repeats all day long. He is always visible, but spends more than half of the time looking out of that hole. Eats anything I put into the tank and comes to the front anytime I am by the tank.
This is a nano tank. You are going to stock nano fish. Not a sailfin tang. So 4 nano fish. Geez....
I bought the two clowns and a yellow watchman goby for my tank. The two clowns did great. The yellow goby didnt last the night. I acclimated them as I should but the goby just didnt last. I noticed my two cleaner shrimp jumping all over the goby when he was first put in, they were digging in his mouth. Do you think that the cleaner shrimp added to his stress which made him die? I am nervous to buy another goby from live aquaria and have it happen again, its not cheap!