I have been trying to cycle my new 75 gallon saltwater aquarium. I had a huge ammonia spike when I added my dry rock. Was reading 8ppm and nitrites were reading 5ppm. I did a 50% WC after giving it a few days. My nitrates did spike a bit but only spiked to 160 after I did the water change. I also got a piece of live rock and added to it along with 2 bottles of bio spira. Ammonia stayed at about 4 for 3 days and nitrtites stayed at 5 and nitrates at 40. Did another small water change when the ammonia was reading 2 because the nitrites weren't budging. The next day ammonia was reading 0.5, nitrites 2, and nitrates 80. I do use RODI. I decided to sit on it for 2 weeks and see what happens. All 2 weeks my API test said I had 0.25 to 0.5 ammonia, 0.5 nitrites, and 80-160 nitrates. I decided to order a salifert ammonia test because being stuck at 0.25 and 0.5 seemed off. Salifert say 0ppm and now my ammonia on api is reading 1ppm. I'm lost. I also should add that we noticed some hitchhikers from the rock. Look like bristleworms from what I can tell. I've seen them moving around at night and as soon as my light in the room come on, they go into the rocks.