If I had to choose two words for the wavy grubfish they would be ‘inquisitive’ and ‘opportunistic’.
Move a bit of weed to one side and out will come a wavy grubfish to see if you have dislodged some tiny morsel.
Lift a rock to carefully peer underneath and quick as a flash a wavy grubfish will be there to investigate with you.
Anything you do which might drive some tiny critter into unprotected territory is what the opportunist wavy grubfish seems to be waiting for.
Simply rest motionless on the bottom for a minute or two and you will soon find at least one or two coming to check you out.