Because I have a goby, firefish and Blenny (plus 2 clowns and a chromis) so the fish are jumpers (first 3) and I’d rather not find them on the floor... I’m sure there are many people that say they keep those fish in topless tanks but I have also read and seen MANY of them that have jumped out and it’s really recommended to keep a lid with those fish and I just prefer the look of it with the lid... then if I remove it I have to buy new lights etc... and the ones that are in the lid grow my corals just fine because I only have 1 sps because I got it for free... and it’s at the top of the rock work and is growing/doing great... the rest are just zoas/palys, and some lps and they are all growing great... so no need to change anything if it’s working
My larger tanks all have screen tops but this one is fine the way it is... it’s has an awc and I use the Red Sea program in it and all has been well....
But I would love to see what you mean about raising the lid or whatever because no one anywhere has been able to fit that skimmer.... I have spent hours looking over every forum and asking people like marine depot and brs and they all say it won’t fit... so if you could explain what you mean I’d love that because I would love to upgrade it....