Hi Don't know exact ratio, I just put some water with the vermucelite and than squeese the water out again, put the eggs in and when the eggs collapse I add little water. But If the eggs are due to hatch (with my ornates after about 65 -75 days ( depends on species))don't add any water anymore, they will collapse and hatch

On topic:
All 10 eggs from the first batch hatched, pretty happy with the 100% ratio....

gr. Kamiel
www.agamen.nl