I haven't had any issues with mold yet. I wipe the glass down once a week, and I would eventually like to set up a CPU fan pointed at the front glass. I think I would need a mister or fogger on a timer for the crpyts though if I do this.
I have run into an issue growing algeas on the rock ledges where water is running over. I have reduced my light and grown christmas moss in the area. This has helped. My nerites also crawl up on the ledges to scrape algea.
Still working on hanging or mounting my lights so I can take better video/photo.