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Im going to fishless cycle my 125g but i dont understand the articles on fishless cycle. I had already started a traditional cycle, but i quit that after i found out i needed to add a lot of biomass. the ammonia is already at 2.0 to 2.5 mgl. Its kind of hard to tell. Will someone help me

No fish in this tank, correct?

Instead of going into a long post on what you should do I am going to ask what about the articles don't you understand. Might be easier to help from that angle.

I know that you get the ammonia up to 5 ppm but after that i dont know what to do

You didn't answer.... Are there fish in this tank? If so, go back to your regular cycing of the tank.

If there are no fish present you should be adding between 5 to 10 drops of ammonia per every ten gallons of tank water daily depending on the bioload you plan on sustaining once the cycling process is complete. Five drops for a lighter bioload, ten drops for a heavy bioload. As soon as nitrites are detectable you are going to begin to decrease the amount of ammonia you dose everyday by half.

You can cut the normal time it takes to cycle the tank in half by seeding the tank with objects, gravel from an already established tank.

no, no fish