Yeah, I'm looking forward to starting up the reef tank again! It'll probably be a few years before that happens, though. They're a real pain to move, even something as small as a 30 gallon. Whenever it happens, I'll either be doing a percula clown and bubbletip anemone tank or a small soft and LPS coral reef with gobies and shrimp.
Tiger conchs and fighting conchs are probably the same conch, just by a different common name. Yours looks just like the fighting conch I used to have. If you continue to have trouble with your shrimp bullying your conch, try deepening the sand bed a bit. The conch should make use of the deeper sandbed to burrow away from the shrimp.
Two Ocellaris clowns, a peppermint shrimp, and a clown goby will definitely be okay in a 20 gallon if your tank is established and your filtration is sufficient. The addition of the royal gramma is where things get iffy. They're more active than the clownfish and clown goby, and more suited to a 30 gallon tank than a 20 gallon. Try adding your clown goby, seeing how things work out, and going from there.
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