Check the listing for details. Betta Fish Tunnel – Aquarium Rest Shelter, Safe Hideout. Color: Multicolor, Condition: New. Listed at 5.85 USD. Give your betta a fun and enriching place to explore with this Betta Fish Tunnel, designed to encourage natural behavior, provide security, and add personality to any aquarium. The smooth, fish-friendly edges prevent fin tears, making it ideal for both long-fin and short-fin varieties.