Hi mfk, I come to you guys with a problem I'm having. I wanted to give my chili rasboras a little bit more room so I went out and bought a used 6 gallon eheim aqua style. I transferred them from my fluval spec into the newly established aquarium and added seachem stability along with some filter media from the old tank. The next morning I wake up and they had all died. I tested the water and everything was 0 ammonia, nitrate and nitrite. I'm assuming if the water was bad I'd have high ammonia spike. I'm also thinking since stability is a dormant bacteria it might not have had enough time to activate. Now I go out and I buy a bottle of dr tims active bacteria thinking it will instantly cycle the tank and I add 4 pea puffers. I wake yet again to see them dead. I tested the water and the ammonia is a .25 a shade greener then 0. Was that enough to kill the fish? How should I continue? What is the best way to continue to cycle tank? Since there's traces of ammonia the tank cycle has already begun correct? Now should I wait till everything goes back to 0 to add fish? Should I do a water change?