Another possible problem not enough oxygen at night. Fish need more o2
than most inverts. How much water movement do you have in the tank? If
you do not have enough water movement you could have lot o2 levels at
night, causing dead fish in the morning.

Kim


wrote:
Maybe someone can help me. I have a 90 gallon tank set up with live
rock(from tampa bay sal****er). The tank is about 3 months old and has
been doing very well. All of the levels check out ok and water changes
are done every 3-4 weeks at 20-30 percent. Recently, I started buying
fish, and with the exception of a few most of them have died.

I have the following items in the tank:

coral banded shrimp
fire shrimp
5 peppermint shrimp
2 small manits shrimp
There are many urchins and there are 3 anenome's(1 condy, and 2 bulb
anenomes)
2 tomato clowns
1 scooter blenny

The follwing fish have died:

Yellow tang
Naso tang
bicolor blenny
black blenny
mandrin
cardnial fish

My question is this....What could be killing these fish....Could it be
the urchins, anenomes, or maybe the shrimp. I am baffled because the
rest of the tank looks completely healty and everone else is thriving.

Thanks,

Marshall