I have a question for all you experienced in this hobby. I have a 150 gal reef tank with a sump thats been running for a year now. Everything has been going great. I want to add a 2' x 2' x 2' cube to the system to hold a clam for a while. I have heard that by adding live sand to a existing tank it will have to cycle again???? What would be the safest way to introduce the new tank with my system. Im going to use the same sump with another pump for that tank. No other fish are going to be added. Any help will be great. Thanks Marc