sponge

Might have got too heavy for it's own good 

Any change in color recently?

If you do frag it, keep it submerged and place the frags in a similar lighting situation.

Really depends if anyone wants some. I haven't seen sponges sell very well in general unless they're a nice blue color.

Let the Sponge find it own place. As it swirls around in the current, it will get lodged in a place it probably likes to grow. If it gets chopped up in a powerhead it will start growing in several places.  Sponge is awesome and really helps promote reef stability. I usually give away small pieces of different Sponge that is growing in my system, yellow, black, white, pink, etc. I have fragged and attached Sponge to rock with elastics. It fully attaches within 2-4 weeks. Keeping it submerged is not so critical for these common types of encrusting Sponge.