This is a mineral oil submerged computer. Mineral oil is a liquid that looks and behaves like water but does not conduct electricity, hence why it is safe to run electronics inside it.

Aquarium Reactors and Fluid beds Media reactors are used to remove impurities from the water and to keep the water moving. They are made of a porous material that allows water to flow through it. The water is then forced through a series of filters that remove the impurities.

Aquarium cycling is the process of creating a biologically safe environment for fish in a new tank. It involves introducing nitrifying bacteria into the aquarium to regulate the nitrogen cycle. These bacteria curb the effects of ammonia buildup caused by the breaking down of fish waste.