[falco]

Ok, so my blue throat trigger is missing. I have had him for about 3 months. Normally he hangs out in this half cave thing he constructed, but I have not seen him for 3 days. The tank is a 180, other inhabitants are
1 purple tang
1 sailfin tang
1 magnificent foxface
1 neon goby
1 purple firefish
2 Solomon Island true percs
1 diamond goby
1 cucumber
1 tuxedo urchin
2 cleaner shrimp
1 fire shrimp
1 peppermint shrimp
bunch of snails and hermits

My last fish added was the purple tang, he went into the display about 1 week ago. At first I thought he was intimidated by the purple tang because the purple tang is about 5" round and the blue throat is about 3 1/2" across. So after not seeing him come out to eat 2 days in a row I moved the peice of rock that he hangs by and nothing but clean sand. I also moved some other rocks and no peices, no nothing. I tested my water and no detectible nitrites, nitrates or ammonia. I also have egg crate on the top of the tank. If someone can help me solve the case of the missing blue throat I would really appreciate it.

Thanks,
Jack