First Grow, with 2 different seeds

Seeds germinated in two days I used Rapid Rooter plugs, upside down, split with seeds pointed down. I put them in coffee cups and a baggie over them by a window that gets indirect light. Once I saw a root showing I transplanted them into the Hydroponic buckets. I have the grow light set to lowest setting at 28 inches. One of the things that happened was I marked the plastic baggies with the different strain names. Without thinking I pulled off the plastic baggies and tossed then. NOW I have to figure out who is who. Second thing that went wrong, was my Ph meter went out of Calibration. I bought a new one and re calibrated the first. Lastly, to ge a good Ph reading with bubbleponics you can't just stick the Ph meter into the bucket, you need to remove a sample and read it outside the bucket. The bubbles make the meter jump around.