I am glad you are doing fishless cycling before getting the fish.
When it comes to live bacteria products, I always use up an entire bottle at the very beginning. Two reasons for it. First, once you have opened the seal, the product will not last long. Second, when you seed the live bacteria, you want as much as possible to give a true jump start.
From your readings, it seems to be getting close to the final stage of fishless cycling since you got both nitrite and nitrate. There is definitely the need for more nitrite eating bacteria, and it will take time for them to develop.
I'd dose ammonia every 24 hours instead of every 12 hours. Minimal 2ppm is required. Aim for 5~6ppm concentrate of ammonia if you plan to add a lot of fish at once.
Yes, you might get an algae boom if the ammonia and nitrate concentrate stay high. You may do water changes once nitrate get higher. Plants need at least 7~8 hours of lights a day, but any more than 10~12 hours will be asking for algae boom.
If you have any more questions, feel free to ask.
Good luck on fishless cycling. I look forward to see you aquarium when it is fully stocked with fish.
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