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The pieces that your looking at in the above pics aren't porous at all. They were meant to be purely "decorative" and will occupy the top of the "reef". I couldn't make them that porous because of the delicate shapes that I was trying to create.
I wouldn't say that they're that strong, either. Strength isn't necessary because they aren't going to have to support anything heavier than coralline algae and some encrusting species of coral. I would say that they're about as hard to break as real "live rock", though. You have to want to break them to get them to crack!
Now, the "base rocks" that I make to support all the other rocks are designed to be quite strong. I don't expect to them to break anytime soon. The ones that I have in my tank have been in there for 2 years and are doing the job nicely. They, on the other hand, are quite porous. They take a little while to drain if you have to remove one of them from the tank for any reason. On a scale of one to ten, some would be around an 7 and the ones your looking at above would probably be a 2. Remember though, the ones your looking at above aren't for biological filtration, they're my attempt to make it look a little more realistic.
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