A lazy way to grow cactus from seed | Episode 3: Five week update - dealing with mold, fungus & rot

I can't believe that 5 weeks have passed since I published my first video on how I sow cactus seeds! I mean, it's already 2023! Time is flying, so if any of you have contemplated growing cactus from seed, don't wait, sow now.
DISCLAIMER: I am a beginner grower. Take anything I say with a grain of salt. The only way to find out what works for you is to try. I have yet to find a growing process that works consistently for me, so it's a constant learning experience. This video series is more of a vlog on this leg of my cactus growing journey. With that said, enjoy!
Some of the common issues I encounter in the growing process are shown with this batch of seedlings at 5 weeks old - green algae, mold, rot, rust (?). Green algae and mold have been appearing since my last update video at 2 weeks - I have been periodically spraying with fungicide (Physan 20) since then. At 5 weeks, I now see seedlings rotting, which is my cue to start letting fresh air into the trays. That's why the question of "when do you start acclimating seedlings to air?" is so difficult to answer. It completely depends. One tray I waited 3.5 months to start opening the vents on the dome, the other, 5 weeks. Keep in mind that I do not sanitize anything which could be causing some of the issues. You can also see that I have a more difficult time with Ariocarpus than Copiapoa. I find Copiapoa to be more forgiving when growing from seed, which is why I am growing so many of them. They're so fun!
Video Series: A lazy way to grow cactus from seed
• A lazy way to grow cac...
Connect with me on Instagram: / cookiescacti
DISCLAIMER: I am a beginner grower. I have yet to find a growing process that works consistently for me, so it's a constant learning experience. This video series is more of a vlog on this leg of my cactus growing journey. With that said, enjoy!
Below are links to the supplies I mention in the video.
1020 Trays without holes:
www.greenhouse...
Tall clear dome for 1020 tray:
www.greenhouse...
Disclosure: The links to Amazon are affiliate links, which means that I earn from qualifying purchases as an Amazon Associate. There is no additional cost to you. I encourage shopping around as always.
Physan 20 fungicide
amzn.to/3jBAEuK (paid link)
Grow light without dimmer: SPIDER FARMER SF1000D (this is the one I use)
amzn.to/3OSPR6c (paid link)
Grow light with dimmer: SPIDER FARMER SF1000
amzn.to/3STyRyJ (paid link)
Connect with me on Instagram: / cookiescacti