Lets dose ammonia again just so we can guarantee that we are keeping that part of the cycle. Once the ammonia is gone do a water change to get the nitrites down to a readable level. Then wait a couple of days and measure again. It should not increase in those 2 days.
ok thanks Dalto. do dose to 2ppm? then when clear of ammo do a 100% (this may be a little hard as the filter is about 5G, it will probably end up being 90%) wc as mebbid suggests?
Thanks guys for all your comments and help! ...