I took the lid off because I got bored and hung a d120 over it... water evaporates like crazy now, and my biggest concern is dog hair... MrHarvard, so you have pics of the rimless? Ours is just set up as a mushroom and anemone garden right now, I got lucky and it came with a media basket, so far it's been running really stable and clean, just need to get something better for cleaning the glass