[banditpowdercoat]

Also, there is the possible loss of Oxygen exchange with a top. More prevalent in SW tanks than FW as SW doesn't hold oxygen as well as FW.

That said, there are a lot of successfull covered tanks. Plexi is probiballly going to be the cheapest and clearest. I had 4mm glass covering one of my tanks once, and was forever cleaning it. You could see the light difference even with clean glass. Now, I just live with the evaporation. try keep tank a touch cooler? room a little warmer. That will lessen evap too