I wonder why that is?
This isn't my first notho species over the years I've had Eggersi blue, Foershi, Palmqvisti and Rachovii. I've really only started keeping them again recently after a number of years away from them. Only recently built a fish room so i can try and get and breed as many killies species as i can find. I too used to spawn them on fine sand and sieve the eggs out before storing on peat.