Hi i have a 30 gal tank that cycled last week.Well i noticed yesterday the ammonia was starting to come back.It was .25. Nitrites were 0. nitrates were 5. so i did a big wc. I did 50-60% wc. Now my readings are for ammonia are 0, nitrites 0, nitrates 0. Is it normal when you do a large wc, your nitrates go from 5 to 0? Is it ok for your nitrates to be 0? I hope yall will be patient, i have a few more questions. I have a 25 gal and a 30 gal that are in the process of cycling. The 25 gal will be cycling 14 days tomorrow. My ammonia in this tank is 1.0 The nitrites are 0 and the nitrates are 5. How long before i could do a wc on this tank? I used safe start and i dont know why it is NOT cycling. Ok the last tank is the 30 gal. It has been 8 days cycling with safestart and it is showing it is cycled. The ammonia is 0. The nitrites are 0. The nitrates are 5. Is it normal for tanks to be at 5 for the nitrates?Also although this tank is showing signs of being cycled, it would be best if i waited the 14 days BEFORE doing a wc ,right? Thanks all for reading this! All info is welcomed.