My colony of T. carnifex have started to lay eggs after 3-4 years of trying. I have not seen any promising eggs that are going through morphogenesis. The ones that seem to be taking shape, the larva turn white. I know from Patterson's book that this species has a genetic trait that 50% of the eggs abort during the neural cord developement. I was expecting this, but was hoping some would progress. I have two gravid females and three courting males. I was thinking maybe the first few eggs were infertile due to they never progressed and turned white. Then tonight I found some that has actually progressed (started morphogenesis) but they do not look viable. Their tank is well planted with elodia, java moss, and water sprite. I thought the elodea would be their first preference, but to my suprise, they are laying on the water sprite and some java moss as well. I'm doubting my plant material now. Any input with plant material, temps., lighting etc. would be beneficial. Their tank gets 12 hours of light and stays between 59-63F. Should I try new plants, modify the light, or even cool the tank a little at night to replicate normal drop in temperatures at night in the wild? Thanks for your help.