A question for you guys that have started up new systems. After allowing 5 weeks for my system to cycle, I purchased 2 chromis on Sunday as the first livestock in my tank. One never reappeared after release, the other is doing great, eating and swimming in the current. Should I start digging through a 100 lb live rock structure and look for the likely dead fish, or do you think the system can absorb the shock of a dead fish. It is worth noting this rock was purchased on craigslist and has been part of a system housing fish for 10+ years. No ammonia or nitrite, nitrates at 25ppm.