Nice choices. Clearer/skunk shrimp do get big. Mine is bigger than my hand spread wide after 6 months and my buddy has 5 that dwarf mine. You do have a nice over hang for it to setup shop and do some cleaning. Clowns really don't need much cleaning or really liked to be cleaned from my experience. The yasha is tiny and a hider.
Hermit crabs I would go with dwarf blue legged. They grow big too IF you give the shells to grow into. Electric blue legs are really cool looking. Mine hides, because the red leg is a jerk and walks all over my corals.
I would let your tank come into its own before adding your 3rd fish. You don't want to bomb your tank.with a bioload it can not handle.
Swales and Swissguard basslet are rated for a 10g. My swissguard is a best friend and sleeps with my clown. He is the best tank mate/model citizen. They also both love the same food. Flakes especially.
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That swissgaurd looks familiar...

and im like 90% sure my tank is cycled, How would I put some ammonia in the tank a dead shrimp maybe some ghost feeding?

