The substrate is pretty odorless unless I put in a fresh batch of coco coir. The real odors come from tortoise butt and Tuna Tuesdays. Just kidding.. they get tuna maybe once or twice a month. But those are the days when the food needs to be removed after an hour. Almost all of the tuna is eaten (their favorite treat) but what tiny particles are left smell horrid if left unchecked. And to be honest, I don't spot check daily. You can probably spot hatchling sized turds that are days old lingering in the enclosure. And nope, they don't smell.. sometimes.
I started back at the beginning of the thread and I felt like I just grew up with your tortoises over the past (almost) two years of their lives One of the things I love about the planted enclosures (except the look of them) is the ease of maintenance when compared to using other substrates that aren't planted. I know you still spot clean daily and I am sure that helps a lot too, but does the enclosure have an odor to it at all? From what I have heard they don't really smell but it would be nice to hear from you on this.