20 Gallon stocking advice welcome

[clonefish81]

I have a 20 gallon AIO tank and have a stocking list wondering if it would over stocked
I currently have
2 clowns (juvenile) right now
2 Trochus snail
Want to add
1 Watchman Goby
1 Pistol Shrimp
2 Cerithium snails
2 Nassarius snails

 

[chaples55]

I have pretty much exactly this in a 15 gallon AIO cube, plus a springeri damsel, and everything is thriving

 

[ecoreefguy]

With limited space I would a 50/50 selection of things you really really want and things you really really need