Yup that looks all fake to me, I would think it would be pretty hard. If you think about all the stuff in our tanks that is in the water column it has to go somewhere. Real coral would have the ability to remove any thing that falls from the water column on to them. The fake coral will not, so if at the bare min, let say you never have a HA problem or any other kind of hard to deal with algae, can you imagine trying to scrap coraline algae off those? If you don't keep up on it, it would build up fast. I would think you could soak these, but then I would personally be worried about fading of the color off the fake coral. Personally depending on what fish your planning on keeping, you might be able to get away with using real coral, and just choose something like softies and zoas that are pretty cheap (just incase they get ate) and wont need nearly the light or attention as LPS or SPS.
hth
d