I filled my tank last weekend (ro/di water) and added some bagged "live" sand and a few small pieces of cured lr from the lfs. Saturday afternoon I added 45 pounds of figi lr that I ordered. I had tested the ammonia on Friday and it was showing 0 then, which is what I figured since I had only added a few pieces of lr. I just tested the ammonia (about 48 hours after adding the 45 pounds of lr) and it's now reading 8.0. I tested it twice just to make sure because it seemed so high. Do I need to do a large water change? If so, how much? I'm guessing the ammonia getting this high has probably killed any hitchhikers that might have been on the lr. Any other tips/suggestions/etc.?