is it porous? it looks very solid. also since you bleached it, you would want to do a few more things before adding it to your tank. here are some steps if they are of any use.
1. soak rock in 50/50 bleach/water solution for 48 hrs
2. drain soaking container
3. soak rock in clean freshwater for 48 hrs
4. drain container again
5. repeat step 3
6. add 2 lbs of baking soda per 15 gallons of water and soak for 72 hrs
7. drain container
8. soak in freshwater for one more day
9. take rock out and let it dry for 72 hrs
the baking soda is to lower the PH from the bleach and neutralize the acid. if you just bleached the rock then put it back in the tank it will spike your PH, as well as cause other annoying problems.
