Just wanted to tell you I love your tank. I can almost feel your enthusium and excitement. I am about to start a cycle on a 75 gal and hope it looks like your 90, my only regret is I know I will regret not getting a larger tank! LOL. I have a reccessed tank and can probably upgrade to something larger as long as its 48 in, it can be wider and still fit in the opening. You sound as excited over the hobby as i am. I had 4 salt tanks yrs ago and had to give them all up, (the hobby has really changed since then) but I know the hobby is very addicting. My fiance is going crazy with my enthusium, he is trying to learn and be apart of my addiction. Good luck, and keep us informed on changes and additions.