An aquarium heater can be accommodated with the aid of the biOrb heater stand. The aquarium can then house small tropical fish. The acrylic stand fixes to the inside of the biOrb to provide a flat surface onto which a 50 watt heater can be fixed. Although designed for use in the biOrb, the heater stand can be used in most aquariums if desired. A snap out section in the biOrb light unit provides a gap into which the lead from the heater can rest, keeping the lead tidy whilst allowing the light unit to remain snugly fitted in the top. (heater sold separately)