Hi! Total newbie here. I cycled my tank for a little over a month with live rock/sand and Microbacter7. My readings last week were at zero. I purchased my first clown on Saturday and he was fine until this morning (Tuesday). He was swimming towards the top of my tank for a bit and then later on he was dead. I ran some testing and noticed my Nitrates spiked. My temperature was 78F and I have two Vortech mp40 running at 50%. Any ideas of what killed my fish? Was it the Nitrate spike? What can I do to prevent this in the future? Thank you! Karen