Fishless cycling using Dr Tim's One & Only live bacterial product

I think you need to add a lot more than just 7 drops. Even a fully cycled aquarium won't be able to convert 2ppm ammonia in just 25 minutes (more like in 12 hours). I have read customer reviews saying Dr. Tim's ammonium product need way higher than recommended amount to achieve the desired ammonia concentration. If you keep dropping so little, your tank isn't going to cycle properly simply because there is too little ammonia.

If you are aiming for 2ppm ammonia, then you should drop enough to get a reading of 2ppm 25min later.