Question about planted aquarium and fishless cycling

Took water into the pet store to have them double check my findings. They said if there is any ammonia its no more that 0.25, nitrite 0, nitrate 40 or less, pH 8.2 or higher. Was down to 3 zebra danios and two guppies last night after loosing another zebra and female guppy. Decided to take the zebra danios I had back to the pet store. The one just would not quite harassing the other fish. I have a male guppy and a female left. Cleaned my tank today and did a 50% water exchange. Also got a commen pleco to help keep the alge down. My 8 year old son and I was trying to find the male guppie, female had been chasing him away some today, when my son says, "Mom there's a baby fish!" I was like your crazy there aren't any babies in there. As I kept trying to find the male guppy. I was afraid it was dead and wanted to get it out if so. I moved a rock then my drift wood and l saw the baby my son had seen. I have several fry hanging out and hiding in my pants and around the drift wood. They are so cute. I wonder if I vacuumed any of them up when I was cleaning the tank earlier. I don't think I did. Hope one or two make it!