I live in Tokyo and don't get out to the fish store very often, so I have a bad habit of trying to do everything at once when I am there.
Two weeks ago I noticed that hair algae was starting to be a problem in the display tank -- hexagonal (16 gallons). I happened to be going that way so I came home with a
skimmer to hang on the side, and (the stupid) a powder blue tang to eat the algae.
The tang went to work on the algae, the
skimmer skims like crazy down in the
refugium -- horizontal (16 gallons) All was well.
Noticed that the tang spent a lot of time swimming by the powerhead -- and then this morning I found him dead. Today I drove into town again and happened to listen to the live podcast where they talked about Tangs! Wish I would have heard that before. My stupid! Poor guy didn't have any room to move. And now the algae is starting to grow back again.
So today I once again dropped by the fish store and wanted to beef up my cleaning crew and pick up some
macroalgae for the
refugium. Got some snails, hermit crabs and a camel shrimp.
However, not two seconds after dropping the camel shrimp into the tank, the red scooter blennie grabs him and bites off his head.

Never saw that coming. Is that normal? I have had shrimp in the tank before but not since we got the scooter.
Main Tank
Three small percula clowns
1 larger tomato clown
1 blue damsel
1 Bangii cardinal
1 Red scooter blennie
Green star polyp coral
Clean up crew
Refugium
one starfish
cleanup crew
lots and lots of copepods