Oh, it was to try and keep some of the floating plants I have under the light instead of floating around all over the place, but it just ended up being a big mess of plants getting stuck to it, not the greatest idea.
So the tank is doing pretty well still, I have been having some issues with BGA for the last couple weeks so there has been lots of siphoning patches of that out, along with re-arranging the plants for better water flow, because I think that had something to do with the outbreak. That, and I stopped using Excel around the same time, so that is another factor. The funny thing is, unlike a lot of people's stories, the BGA is spreading very slowly in my tank, and hasn't ever had a big sudden outbreak. I have recently added 2 large catappa leaves, and along with making the water nice and noticeably tannin-y, they seem to be further slowing the growth of the BGA. It has been lurking on the glass under the substrate, so I'm hoping that after one more good clean, the antibiotic properties of the tannins might slowly kill the microscopic bits that sure surely left.
edit; I also noticed that BGA was growing on some of the water lettuce leaves, so I have switched over to Amazon Frogbit and the 2 types of salvinia. Also I got duckweed in the tank at some point and now regret it