Hello everyone, just subscribed. I have been having setbacks cycling brand new 55 gal. freshwater. I have been going for 7 weeks now, week 5, had a PH crash and wiped out any nitrifying bac. I had. Resolved that already (was a KH deficiency). As of now PH 7.8 GH300 KH70-80, all seems to be stable now About a week ago I added another bottle of Tetra SafeStart, ammonia was 3ppm, nitrite 3ppm, nitrate 5-10ppm. After 24 hours nitrites dropped to 0ppm, nitrates up to just shy of 40ppm, but ammonia was still 3ppm. 3 days after adding bacteria I did 1/3 w.c., ammonia dropped to about .25-.5ppm, trites still 0ppm, trates 5-10ppm(already in my tapwater) 2 days later ammonia back up to 3ppm, trites still 0ppm, trates back to almost 40ppm. So theres nitrobacter converting the nitrites, but I dont know about the nitrosomonas converting the ammonia? Did the w.c. mess with the bacteria? ALWAYS use Novaqua+ and Amquel+ to tap water. First time cycling new tank(always had used,established tanks) Just not sure how things should be going from here. ANY and ALL advice or info would be GREATLY APPRECIATED!! Current tank stats: 55 gal. 8 tiger barbs, 3 zebra danios. Temp. 76-78 F PH 7.8 KH70-80ppm other parameters as stated.