I know the forum thing is new to you, but please don't start new posts to repeat what you've already posted. Kinda clutters up the place and makes more work for the moderators!
With that said, I really think you need to reread the stuff about cycling. There are plenty of ways to get your ammonia to read zero, but you need to go through the ammonia spike and nitrite spike to cycle the tank. Until you seen those two parameters go up, then go back down to zero, your tank is still cycling. If I remember correctly, you cleaned out your main tank pretty aggressively, so it'll have to recycle.
The fact that your ammonia is at 0.25, and your nitrites are at 3 tells me that you're over your "peak" for ammonia, but your nitrites are still going up or are near their peak. I'd expect that in a couple weeks, both your ammonia and nitrites will be at zero, and THEN you can safely add the fish back into the tank.