don't you wish you could get that every time you turned the lights on. That sure is a nice surprise but by the size in your picture those fry are have been around a little while.....enjoy
They look like they haven't been out of their cave for long to me. Congratulations on your success. Consider keeping a bunch for your future breeding stock.
My wild breeding group did not spawn this year but I am breeding my older F1 now so from now on all my L134 will be my 2nd generation of tank bred L134. I only have a few large F1 left to sell. Next year they will not be as large because what I have left are close to minimum breeding size/age. I may decide to keep some of them so from now on each year I will have some new breeders.
These are my favorite pleco although I still wish I had a bunch of Zebras. I had a good start of 10 wild specimens but something caused them all to die over night a couple years ago. I never got over that event.