Cut Digitata?

[subman]

If you can bend it I don't think it's sps.
My guess is a leather

[Spyd]

+1. I think it is a finger leather. You can just slice it in the tank no problem and use an elastic band to attach it to a rock if you want to frag it. Run some carbon after you do it if you want to be on the safe side but you will be fine without it.

[banditpowdercoat]

OK Finger leather sounds more like it cause I've never had luck with SPS in m y tank. This one came with the tank 3 years ago. Was 1/4 the size then LOL

[xenon]

The problem with cutting leathers is the toxins they release in the water.

I wouldn't do it without running carbon in a reactor first.