Hi everyone, This is an old thread - skip to page 3 for new plans. I have finally outgrown my little tank all thanks to this wonderful community who has helped me achieve this, in a period of exactly 12 months I went from a lonely clown fish, a bunch of rock & pink coraline to a tank that is bursting at the seams with small colonies & frags. It's an Oddysea 45, what the 45 stands for I have no idea! it is not 45 gal, every calculator I've used puts it at around 30-35 gal based on dimensions. Enough about the old tank let's talk about my new one; I've decided to give Acrylic a shot, I've always had glass tanks & this will be my first experience with Acrylic. New tank is a 55 gal, 48" long, 13" Deep & 19" tall. it's currently not reef-ready and has no overflow of any type, I saw this as an opportunity to create something that is designed specifically to my needs & desires. My goal is primarily to create a fail-safe overflow and I plan to do so with a Herbie Overflow with oversized overflow plumbing. The other goal is silence, from my research and based on other people's feedback the Herbie design will certainly achieve that and I'm going to incorporate a Coast to Coast type overflow box with no weir for optimized surface skimming, it is going to be about 3" tall, 3" deep & 24" long. I'd love to hear your opinions on the use of acrylic tanks vs glass since this is my first acrylic setup, also all comments on the overflow are great since this would be the time for me to improve & modify the design. I plan to use 1.5" overflow plumbing and building my overflow box out of blue 1/4" acrylic. I plan to run about 500-600 gph through the system.