Thank you Dragon, Mike and DJ. I only recently set this tank up and I am used to my 75 and 92 gallon corner reefs where evaporation is quite alot. I did set up a 2 1/2 gallon AGA nano about a year ago and had no evaporation at all due to a weatherstrip sealed plexiglass top. I took it down to make a couple of changes in the canopy and never set it back up.
I did play around with a float switch in the front part of the tank today, it works fine but I can see the bottom of the floatswitch so it will not be there long (but at least I know how to do it if I need to). Thanks again, Skip
PS If you were only going to make one mod to a 2004 series 12 DX what would it be?