Yes it’s safe.
Ah, smart move, I like you already!
Awesome. Just keep ammonia and nitrites under 1 ppm and dose Prime every 24 hours until they’re both zero.I do have a test kit. I’m showing Some ammonia still (.25). The only reason I have fish in it is they came with the used tank I bought so I’m trying my best! I did take over half the tank water and the filter so I was hoping it would be easier to cycle and less stressful on the fish