covering the tank
Steve,
To keep the all the light getting into your tnak you will need to clean it more than once a week. I had tanks with glass tops. FO's and they were encrusted within a day or two. And you are not going to be able to control your heat.
It is like putting plastic coverings over your windows in winter. They collect condensation and trap heat. LOTS. When it starts getting warmer you will COOK your tank. I had a 90 with NO's and it heated very quickly. I was running two fans to keep it cool and barely kept it at 80 on a cool day.
Why waste the cash? This is from experience.. You aren't going to slow the evaporation that much. It will find a way out. It did in the glass top tanks I had. You will make more work than just cleaning acrylic, you will still need to top the tank off.
Save the cost of the acrylic and put it towards decent lighting.
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