I assume they are acrylic or they may be some cheap plastic substitute but me and a number of other people have been pleased with the 2, 5, and 7 gallon tanks from Petco. I've also seen them at The Fish Store and The Shark Reef. They come with light and a wimpy hang on the back filter. Works for good water circualtion along with a small powerhead. My 5 gallon was retrofitted with a 32 Watt custom sealife fixture. It worked great and everything is relatively cheap. They come and multiple colors and looks like something you would put a goldfish in.