Ill get a reading tonight then we can work out a % to change. Im hoping its gone down or worse case the same. Aslong as it dont go up again ill be happy
Since you are in the middle of a fish-in cycle the nitrite reading should be interpreted as toxic. Yeah, I really meant that. You need at least a 50% water change to reduce the nitrite reading to 0.25 ppm or less and would be better off doing a truly large water change like maybe 90%.
You cut your nitrates (and some nitrites) down with your water change, but the ammonia builds up quickly after and stalls at the nitrite phase. The nitrite-to-nitrate bacteria colony is much slower to grow than the ammonia-to-nitrite colony. This will take a while, and still requires large, daily water changes.
If you don't have one already, get a bottle of Prime and follow the bottle's directions for nitrite poisoning.
Your cycle is on its way, but I would prepare yourself for dead fish in your future. If your fish do make it through the cycling process, their lives will be cut much shorter and their immune systems will not be intact. Keep medicines on hand.