oddball fish

Hey guys! Been in the hobby for about a decade now and have done all kinds of cool oddball from breeding dwarf seahorses(h. Zosterae), to mantis shrimp (gonodactilis chiragra), to wartskin frog fish etc.. Im setting up a new 42 gallon reef and want some ideas for some smaller but UNIQUE...

Recently bought a walking batfish at the fish store, been wanting one for years. I have a plan to get it eating, however, has anyone else had experience with one? Would be cool to learn something I've maybe overlooked for greater success.

The Pacific Pearlfish (Carapus dubius) is a very unique and odd species! They are known to inhabit the body cavities of pearl shells, pen shells, Laevicardium cockles and sea cucumbers, which is a sight to see! In house, we are feeding them our Nutramar live Artemia nauplii (baby brine shrimp)...

Just bought an adult male blue boxfish (Ostracion meleagris). Was not eating in the store, decided to pull the $200 trigger anyways. Fortunately I have aged live rock which he is actively grazing on. Starting to show interest in fish foods.

What are some easy to care for, reef safe, oddball fish that can fit in a 16 gallon biocube.