I have put some water and holes in the tub, it may sink but im hoping thats okay since the eggs were immersed anyway. some eggs did float away while i was removing them and i left some incase this system fails. would it be better to immerse the tub or leave it floating? If any hatch its crushed flake i feed them isn't it? Thanks for advice. Had fish for years but no success hatching eggs as they always got eaten. x

only thing that matters is that if it is floating that 60% of it is in water, otherwise any method works fine, for optimal circulation keep it near the filter but not directly in front. when they are free swimming, not motionless, feed either live brine shrimp or very fine flakes. when i feed my newly hatched adolfoi corydoras, i usually give them newly hatched brine shrimp from my brine shrimp hatchery.