I look at it similarly, I have a goby pistol shrimp pair and personally they don't take up too much room at the bottom in their sand cave thing. I have clowns but they tend to stay in their anemone. etc etc I guess you just gotta find the balance that works in the tank with parameters and whatnotEvery tank is different. Different tanks though roughly the same size and live stock have and can handle different bio-load amounts. 6 or 7, but tops. I wouldn’t recommend having that ‘top’ of many fish, but if it ends up working than hey ho. Personally 5 fish would be my max, if I had one of the sand dwellers not taking too much swim room.