Morning folks. As I am finally getting to the point of stocking, I wanted to ask a question about fish compatibility. So far I know I will have a pair of clowns, and way down the road attempt a mandarin goby. My question is on my final fish, a diamond watchman goby. I have had them before and love the personality. However, I read they are more for 30g + tanks and I have been told about other gobies, so question is do they all do the sand sifting thing? Is that a goby trait? Or only specific species? Thanks for input.