thanks for all your response,
I cut the acrylic sheet and cover the fudge and return chambers, it works greatly. I don't have any heat issue, because my sump is external (not under the stand), and I run the room AC as well.
Hi,
I'm planning to reduce the evaporation in my sump by using a lid to cover my fudge & return sections. Is it ok to do it? Also, I grow macroalgae in my fudge and have a CP light chamber.