The tank will probably do a mini cycle where you see a small peak in ammonia an nitrite but nothing like a full cycle in intensity or duration. Using the same filter helps the transition a lot faster, so does the substrate.
Hard to say if the eggs will have an issue or not, but since they are convicts if they don't make it you'll have another batch in a less than a month anyways.
Hard to say if the eggs will have an issue or not, but since they are convicts if they don't make it you'll have another batch in a less than a month anyways.