I got TBS rock when I first started. It was fascinating seeing all the different lifeforms on the rock. The only thing you have to watch out for are the mantis shrimps and gorilla crabs. If you get the TBS, I would recommend you keep it separate from your tank initially so you can make sure you don't have any unwanted hitchhikers, unless you are just starting your tank. I actually would consider getting more. Let me know if you are still going ahead with the pooled order. I guess it would depend on where you are located and how much of the shipping I would be in for.