ReefCentral is a good place which is full of valuable informations about keeping reef fish. I also want to do a little contribution to this database. My pep is one of the nine pep of Koji. My pep is really a small one(may be unlucky) of about 3.5cm from head to tail. I had been kept it for 15 days.
My tank have no live rock, no sand bottom and full of plaque(aptasia everywhere) but I have a mud refugium with many amphipods. The lighting condition is 12hr room light and 12hr dim light reflected from the refugium nearby. I do not have any other type of lighting in my tank. My room lighting is only one 48 inches fluorescence daylight tube which can be buy anywhere and I mount this tube on the ceiling of my fish room. I do not do any QT procedure(playing fire) on this fish! Ha! Ha! I hold this fish with another juvenile anglefish on one side of my tank. I use eggcrate to separate my tank into two half.
My observation on this fish is that she only pick on the false decoration and the glass. She dare not to pick on the bottom because all of my tank bottom is full of aptasia! I guess that she only eat very tiny crustacean and pod from the rock in natural habitat. She have no need to pick on the water column because all what she need can be find in her surrounding rocky environment in her natural habitat.
My way of feeding is that I use a fine airtubing and I mount a cleaning cotton clothes at the outlet of my airtubing. I use a doser to dose live brine larvae 24 hrs for her via the airtubing. Hong Kong have no supply of any type of pods, arctipods etc. I observe that she very often pick on the cotton clothes and the egg-crate as well. She pick on the live brine shrimp larvae stick on the surface of them. After 14 days, she learn how to pick the brine shrimp larvae from the water column as well. I milled hikari mysid into very fine size and pour them into the water column. She also eat very little on them but if the size is too large(My guessing), she will spill it out of her mouth at once. Live brine shrimp larvae is still her main diet now! She use to feed during day time(She will swim everywhere to seek for food) and hide inside the under ledge of my artificial rock during night time. She usually stay claim and less active during the light is gone. Therefore, I do not think that this fish get use to feed during night time.
Above is only my personal opinion and observation!
I hope that my observation and informations can have some reference value on the future owner of this amazing fish!
I promise to report if my fish is gone in some day!