Jul 29, 2010 #21 mgamer20o0 Aquarium Advice Addict Joined Dec 13, 2007 Messages 5,987 Location so cali well you dont have to use it lol thats a very odd set up. maybe thats why it was a deal lol
Jul 29, 2010 #22 B BillD Aquarium Advice Addict Joined Jun 1, 2005 Messages 2,764 Location Whitby, Ont,Canada The top does not fit tightly enough to preclude oxygen exchange.