Skilletfish

One species in three tiers: the Skilletfish, a clingfish that spends its life stuck to the underside of rock and shell by a suction disc on its belly. These are tagged captive bred and reef safe, which is a rare combination for a cryptic marine oddball, and it is the reason to pick one over a wild-collected clingfish.

Set your expectations on visibility, not color. A skilletfish hides by default and you may go days without seeing it, so this is a fish for someone who likes knowing it is there. If you want something out in the open all day, spend the money on a goby or a dwarf angel instead. Captive-bred stock ships better too, so the lightly medicated tier is usually enough here.