Well so far, so...something. I have had some rock turn out great, some not so, and some start to mold! The mold was from some maccoroni. I let it set to long befor I put it in to cure. Who has used viniger to speed the process of curing up? I had been for a couple weeks and am now to freshwater only. No ph tests yet as I am a few weeks away from even wanting to know. One problem I have just over come was the weight. A few rocks where very heavy, but after I took several differant drill bits and steel brush drill attachments to it, it looked great. I actually wond up going through all the rock and drilled holes, or marked the rock in some way. I found that masonary bits work best, but auger wood bits work good too. I got a cheap set of both types of bits, (wasn't about to use my good wood ones) and wore out several bits yesterday. The results are great! I used a rasp to make the holes uneven, wiggled the bits around to hollow out the insides more, and used the wire discs to rough things up. I also tried every dremal bit I have, but they are all too small, drill attachments and bits are best.