Artemia Culture: Use a clear two litre soft drink bottle with the cap still attached, wash bottle to remove all drink residue. The bottom can be cut off the bottle then a 4mm hole drilled in the cap and a length of airline siliconed into the cap. I use another bottle cut at halfway to support the first bottle inverted in it then fix airline to valve then to the air pump, a one way valve can be put inline to prevent any backflow of water to pump.   Put 1 litre of