make sure the nursing tank is bare and the water is the same quality as in the main tank they came from. if you can put an air pump/stone in the tank, position the airstone underneath the ornament that the eggs are on so the bubbles pass over the eggs. this will keep the water and oxygen circulating around them and mimics the female 'fanning' the eggs.
if you see any white eggs, these are infertile and will go mouldy. if not removed the mould will spread to the 'good' eggs too and kill them
you can add m.blue to prevent fungus growth
you may want to also start hatching some brineshrimp eggs too so the babies have a food source that is small enough to eat when they need it