I went with a 300 g which was all I could afford at the time, but now I just wish I'd have waited a bit and gone for 500 gallons. I guess in the long run it worked out though cause they had to build it for me [not off the showroom floor so to speak] and when it finally showed up we couldn't get past our front door. I eventually had to take out the bedroom window and get a few of my neighbors to help chaingang the tank into my room. The tank you are welcome to is 6 feet long and 24 1/2" tall but it's only 16 1/2" wide so you may be up to the same situation with the 150 g if your looking for more of a wider tank. But I'd say its nothing like a show tank where your looking at a 100 g where it's only 10 or 12 inches wide.