IM trying to cycle my new 140 and its just not working. It started off by filling it 1/4 full with old water from old tanks and adding a filter from an old tank and about 30 goldfish. I kept about 30 goldfish in there for about 2 weeks but everyday some would be dead. I kept bringing water samples to my LFS every week and they keep saying to do 25% water changes. Its been over a month and i even went to a different LFS today and they said the same thing, 25% water change and come back next week for another test. I believe they said nitrate was too high.