I also lost a few runts in 1 or 2 of my clutches. They do grow super slow but I'm wondering if it's possible they need seasonal temps to experience growth spurts when it's warmer...? And yeah, sexing is the hardest part about raising Giant Fischer's.
Here's some photos from today. I suspect the greener one to be female, the fired up one to be male, but still not sure. These are the two biggest ones.