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If you're gonna add snails, make sure your tank's cycled. They're sensitive to ammonia spikes.

Dwarf Sagittaria could work if you want a grassy look. It spreads but not too aggressively in a small tank.

Soft corals are your best bet in a small tank. Xenia, Kenya Tree, and Leathers are forgiving. Just watch for allelopathy—some release toxins that can mess with other corals if the tank's too cramped.