So I get home today and as soon as I walk in my house the smell of sulfur hits me like a pimp hand. It was so bad my eyes were burning. I checked my tank, 60 gallon with live rock that is fully cured, red sea hot skimmer, uv sterilizer, rena xp3, 2 power heads, 2 clowns, powder brown tang, small lunare wrasse, marine beta, coral beauty, flame angel, and snowflake eel. I have several hermits and snails. 2 anenomes, one condy, the other sebae. Some leather, polyps, frogspawn, sponges, and mushrooms. The tank has been up for about two weeks. Long story.....I bought a used 120 that was already full of 140 lbs of liverock and sand. Set up the 120 but found out it was to big for my living room. So I got rid of it and replaced it with the 60. So basically the sand and rock have been in the tank for like 4 years because we took it straight out of the 120. Anyway...I checked for anything dead. Nothing. I checked my filter and skimmer. Everything is fine there. I vaccumed some of the sand and did about a 10% water change to see if that would help. My ammonia and nitrites are at 0. Nitrates are at about 40ppm. The temp is a steady 79 and all livestock look healthy and are eating. SO AFTER ALL THAT CAN ANYONE HELP ME WITH ANY IDEAS OF WHAT MIGHT BE CAUSING THE HORRIBLE SULFUR SMELL. I am stumped.