Hi everyone. New reefer here. First of all thank you to this amazing community. I custom drilled a 65 gallon tank to install a Modular Marine overflow and built my own sump, largely based on advice from this forum and BRS. Just ran into a problem after filling the tank and starting the cycle. I have 60lb of caribsea live sand and about 40lb of cured (reincarnated) rock. The rocks were bleached, given a muriatic acid bath, rinsed in RODI, then sat for a couple weeks. To start the cycle I added Microbacter7 according to the bottle and 80% of the recommended ammonia from Dr. Tim's ammonia last night. Checked the ammonia levels this morning and they're greater than 8ppm based on my API test kit. I'm in the process of doing a 50% water change, but I'm wondering if this level of ammonia will kill the nitrite oxidizing bacteria in the sand and Microbacter7 and if anyone has advice on how this could have gotten so high. I don't have another kit on hand, but I can order one or go out and get one tomorrow if anyone thinks I should double check it. I know API can have non-zero values for zero ammonia but >8ppm is concerning. I should have done a baseline test after filling it, but I didn't expect there to be any source of ammonia. Spec Grav=1.025, pH=8.0, nitrite=0, nitrate=0. Any help is appreciated.