No problem. If you do dragon rock I would recommend getting a small dental pick kit... It'll say its "ready" to be put in but in reality you'll have a nice week of rock cleaning to do... Which about 1-2 days in I realized that its very relaxing... After you pick out all the dirt and clay and scrub it with a wire brush, get some pure white vinegar and put it in a bucket (no water) and let it sit there over night... Then get an unused toothbrush and scrub off everything the vinegar took off (this will make the rock inert). Then soak it in water overnight and keep doing so until there is no vinegar odor... And vuala you have beautiful rocks...