Getting it from someone else. He has 125g, 90g, and a 40g. I am going to take the 125g with all the rock. I think(but not sure) Im going to leave the sand in the tank with 1/2 inch of water. I plan on keeping at least 140g of the water. Plan on putting the rock in a kid pool with powerhead and heater. This will give me time and not rush. All so all the other sand will be wasted, correct me if im wrong. These tanks are somewhere in the range of 4 to 8 years old. Dont believe I can clean and keep the other sand. Any help would be kind. More info available if needed.