Fish Laying Eggs In Water. The most recognisable eggs are laid by apple snails and mystery snails. After the spawning area is spick and span, the female fish springs into action, laying all her eggs vertically.
Your fish tank must be clean and spacious. Some of the mouthbrooders are gobbies, blennies, bettas, cardinal fish, and cichlids. Sorry to say that goldfish dont lay on the bottom of tank for a week making a nest to lay eggs.