will these two fish eat these ricordea mushrooms

[clownmaroon]

i am curious if these two fish will eat or pick at the ricordea mushrooms pack i may get..
http://www.saltwaterfish.com/10-Multi-Pack-Ricordea-Sale_p_2414.html

FISH== moorish idol, black tang, copper-banded butterfly

i am asking this because i may buy this pack because they spread pretty fast and my fish can pick at them whenever they are hungry and when im not home to feed them...