I got into this hobby a few months ago. At first, my wife was a little upset about the cost. She has always told me I have expensive hobbies. I won't lie because I do. I also do model railroads, R/C planes and helicopters, and now this. The funny thing is now she's all into it seeing how everything is developing. At this time we only have the 30g tank, but she's wanting to upgrade already so she can get her "Dory" fish. I've read that a 90g tank would be great. So, my question is would it be cheaper to build one, just for the sakes of trying something new, or buy a prebuilt tank? Also, I've told her she griped about the cost for this 30g tank just wait in the end for a larger one. LOL.