I know the two spot goby is one of them. They don't form a bond with pistol shrimp either but they need a lot of real estate because they don't do well on commercial food. The BRS 160 had a bonded pair. Are there any others?
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Two spot/twin spots create a den, usually something small under a coral or small rock. Most sand sifters do build a burrow, some are less elaborate than others.I know the two spot goby is one of them. They don't form a bond with pistol shrimp either but they need a lot of real estate because they don't do well on commercial food. The BRS 160 had a bonded pair. Are there any others?