Nice to see a thread for your tank, Trinityblood! Hopefully I'll have a thread of my own like this up and running in a few years.
Yeah, clownfish are a lot less aggressive than other damselfish. Between them and the peppermint shrimp, I think you've got a nice selection of fairy hardy early inhabitants there. I'd definitely hold off on adding anything else until your tank is at least three months old, though. Marine tanks take a bit more time to establish and stabilize compared to freshwater ones.
Little fighting conchs like yours can actually be a bit tricky to keep alive, particularly in small tanks. If your shrimp is trying to steal its food while you feed, try occupying your shrimp by hand-feeding it, instead of using current to push it away or putting it in a breeding net. I hand-fed the fish and shrimp in my reef tank and it worked like a charm - the bolder critters like my percula clowns and cleaner shrimp would come and eat out of my fingers, while the other critters fed on the bits of food that drifted away from the block. Little bits of dried seaweed sheet left near the bottom may also be a nice little snack for your conch to feed on.
If you'd like to add a little something colorful and coral-like in the future, try looking into mushroom corals/polyps and Zoanthus polyps. They aren't particularly demanding in terms of water quality, lighting, and trace minerals and tend to do well in smaller tanks.
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