Hi I set up my new tank yesterday and just tested the water and ammonia reads .25 nitrites 0.0 nitrates .30. The external filter is the same one from my old tank but was switched off for about 3 hours as I was swapping everything over. All filter media was in tank water. I havnt added any more fish but I have gone from a 80 ltr to a 125. The filter is a tetratec ex700 so should do the job ok. Any advise would be appreciated