I believe they are species of Haliclona. Heres a bit of info on the tropical members of this genus (1st and 3rd articles)
Haliclona
As Bob Fenner notes:
"Out of the Indo-Pacific several warm colored Sponge genera/species are collected for the trade; my choice picks are the beautiful blue, yellow or purple Halichondria and Haliclona. These two genera comprise hardy (1’s), hermatypic finger and encrusting species requiring intense light."
It is possible that bleaching could be the result of light shock, like introducing a photosynthetic coral to a new light scheme (which happens with corals that require high light as well). Hopefully those that have faded will adjust and reestablish themselves. In the mean time, Id still suggest a Strong current, and very regular feedings until it is able to produce its own food (color back up)
HTH