Tried a 20 gallon in 1985,got frustrated and broke it down,was too young for the work required.Bought a 55gal in 1992,fish only.Stopped that one due to a fire.Went to a 20 gal in 2000,got so addicted that I have worked my way up to a 75 gal mixed tank.The upgrading is never done.I absolutely love it!Have the Bio classes from local high school come to check it out during the Ocean section.I get such a kick from sharing with an amazing group of young people.Each year,with the new students,I see so much excitement on their faces!It is truly priceless.