11-26-2009, 01:40 PM
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They may well be Corydoras eggs. Corydoras spawn by placing the eggs individually here and there on surfaces like plant leaves, tank walls, heater and filter tubes, etc. The female makes a pouch with her pelvic fins and carries the fertilized egg to a cleaned spot and deposits it, and being sticky it adheres. So you would see individual eggs, not clusters, although sometimes they may lay them near eath other.
Fish often spawn in teh very early morning, dawn before the tank lights come on, so it is not always easy to see them, but the eggs are seen later. Some may hatch into fry, and some fry may survive if they have sufficient hiding spots like thick plants as I see in your tank. Fish including the corys themselves will eat any eggs or fry if they find them.