If it was originally designed as a terrarium, it will not have the structural integrity of a real aquarium. My experience is that terrariums use thinner glass (but not necessarily) that aquariums, since terrariums are not designed to be filled with water, but only to keep a controlled moist atmosphere/environment.Click to see full answer. Consequently, are terrariums and aquariums the same?Terrarium. While aquariums are essentially five-sided glass boxes designed to hold water, terrariums are cages designed for terrestrial animals that happen to be made of glass for ease of viewing.Also Know, what is a Riparium? There is no exact definition of the word “riparium,” though it is generally used to describe a tank that recreates shoreline conditions. For example, a tank setup to mimic the shoreline of a stream or river would constitute a riparium (also known as a “riverbed aquarium”). In respect to this, how do you tell the difference between a reptile tank and a fish tank? if the stains are 2-3inces by the top it was used for fish. If they are midway then probably turtles or frogs. reptile tanks most will have screen tops,no water stains, and a pretty cruddy bottom. but most people are pretty honest.Can a 40 gallon terrarium hold water?Yeah 200g tank is enough to hold 40 gallon water easily. It is the good size for the fish. 20-30 fish can easily survive in this tank. Looks like a regular sliding top terrarium.