I am planning on purchasing a 125gal tank. this will be my first "monster" sized fishtank and I would like to know how to best filter it. I love my fish and would be mortified if I killed them trying to give them a bigger home. I want buy all of the necessary parts before I buy the tank because I believe maitenence is the most important part in keeping a healthy environment. For a tank this size, what is reccomended for a filtration system? Any advice would be greatly appreciated! thank you. 
