This is my current 150gal cube reef. Affectionately known as The Tesseract. It has been set up for 2.5years. The corals were transferred from a 90gal tank I had for 10years. Many of these corals have been with me that entire time. That is a Large Gigas clam shell, used as part of my aquascaping. It weighs between 80-100lbs. My wife's family owned a seafood restaurant for 30years...and this shell was filled with shrimp cocktail at parties. After my Mother in Law sold the restaurant and retired, she gave this shell to me. So, it has been in my wife's family for 40-50 years. I was very happy to use this in my tank...but, it was definitely not easy.