Info
The Mozambique Blenny (Meiacanthus mossambicus) is also known as the Harptail Blenny. Blennies in the Meiacanthus Genus have grooved canine teeth with poison sacks that allow them to inject poison into their prey or in defense.
Meiacanthus mossambicus feeds exclusively on plankton.
Jumping guard
A jumping guard prevents (nocturnal) fish from jumping out.
Wrasses, blennies, hawkfishs and gobies jump out of an unprotected tank in fright if their night rest is disturbed, unfortunately these jumpers are found dried up in the morning on carpets, glass edges or later behind the tank.
https://www.korallenriff.de/en/article/1925_5_Jump_Protection_Solutions_for_Fish_in_the_Aquarium__5_Net_Covers.html
A small night light also helps, as it provides the fish with a means of orientation in the dark!