Hi, I may have posted in the wrong forum, I'm about 3 weeks into my fishless cycle, 60litre, tropical tank. I've used household ammonia and treated the water with Seachem Prime. I have an API testing kit and have been using it from the start. I have documented the readings and it appears that after 12 hours I get high nitrates of 160ppm, and 0ppm to 0.25ppm ammonia. I get Nitrites of 5.0ppm and this hardly fluctuates. Ph normal reads around 6.4 but it does dip to 6.0ph after 12 hours. I have soft acidic water. Every 12 hours I do a 50% water change but lately I've been doing a 80% water change. After a 50% water change I can get the ammonia back to 4ppm and get the nitrates down to 80ppm; the ph goes to 7.6ph. This is also roughly the same for an 80% water change. I have been advised to get some bicarb of soda but I have also been told not to mess about with the ph and it wouldn't affect the cycle anyway. Am I just going through the cycle or am I doing it wrong?