I have had my sailfin tang forever and my pencil urchin(who I think will ive threw the appocolypse). I have added a few fish here and there and some have made it, others have not. Currently I have my sailfin, 2 gold head gobies, 2 clowns, 1 primal bleeny, 1 scooter bleeny, 2 carpet anenomes and a small scissor tail goby. I have bought fish from Petco..... my LFS and 2 different FS that are around 2 hours away. I have killed off about 6 tangs ( kole eye, powder blue and brown, 2 x yellow and one that looked like a perch) 2 fox face rabbit fish. I am also missing a couple sea hares but I have alot of rock that they can be hiding in. Most of the fish have dissapeared. I have checked overflows and have almost tore my tank apart to look in the rock. I have a 180 with 0 amonia 0 nitrite and my nitrate are barely starting to show up. Other than having alot of hair algae everytyhing looks good....... I have 75 or more hermit crabs a couple emerald crabs and a bunch of snails. When I acclimate I have tried doing the drip method and also a bucket method. Fish will be visible for a few days and then poof! Oh and I dont add but 1 fish or 2 at a time. HELP PLEASE