A Macquarium is an aquarium made to sit within the shell of an Apple Macintosh computer. The term was coined by computer writer Andy Ihnatko as a joke (a jibe at then outdated Macintosh 512K) but Macquariums have since been built both by Ihnatko himself and by others. Macquariums are often stocked with 2-3 goldfish which do not require tank heaters and are cheap. But because goldfish grow large, have high oxygen requirements and are messy eaters they require much larger tanks for survival, Siamese Fighting Fish and small shrimp are better options.