Any tang is NOT suited for a 55 PERIOD. Hopes and dreams of upgrading or trading in later are just that; dreams. People get attached to the fish and don't have the money to upgrade so they end up keeping the tang in a less than suitable size such as a 55 and it ends up dying. There are thousands of threads on tangs on here research them. You will find no tang is suitable for anything less than a 100 gallon long (SIX FEET). Some will argue that the size does not matter, experience does etc. etc. blah, blah, blah. Look at the other threads and see the heated debates. Just my thoughts.