Hi everyone! Been lurking the forums for a few weeks now. I was able to score a second hand 90 gallon tank (just needs some TLC) for $50! Trying to figure out a simple (& cheap) DIY lid that would fit this type of top. I was looking into using the polycarbonate roofing type lid but I'm wondering if it would work well since the sides don't have a lip to hold the polycarbonate in place. Was wondering if anyone could give me some suggestions or anyone out theee who has a tank with a similar style top that could chime in. Thanks in advance!