I'm not familiar w/ "humpback" cow, but I had cow(wife bought,
I knew it was a bad idea)
It ate EVERYTHING, clams, corals, rocks, seafans, you name it ,it ate it!
Ate till it's mouth bled, ate algae on pump intakes(and always got stuck and had to be rescued all the time, and thats how it died)
I will NEVER have one EVER again!!!