"RubenD" wrote in message
om...
Everytime I add a new fish to my tank, the other tenants surround it and
show some territorial behavior, especially my dear damsells. This cause
stress to the new fish. My questions is, if you add the fish with the
lights out, would it make a difference in the morning?

Less traumatic perhaps?

I ask because I added a lawnmower blenny and he got chase even from the
yellow tang, and still being bother by the blue tang and of course my
damsell. By the way, the damsell have a particular behavior when
bullying,
he shake his tail on the face of the other fish, why is that?

At the same time I put a tunnel digger goby, 2 days later he was dead
with
blood stains on one side (inside), which suggested me he might have eaten
a
crab and got cut inside.

I'm planning to add either a tiny yellow goby (I'm still considering due
to
the damsell) or a coral beauty which seems more safe to the coral than the
butterflies.

Daytime or Nightime, that is the question?

TIA

Ruben


Adding new fish to any tank is always stressful to both the resident and the
newcomer.
I disagree with those expressing preference to do it with the lights out.
Just imagine yourself thrown in a dark room full of enemies. Where are you
going to hide? can't see!
There will always be fights even in compatible fish.

1. Keeping the livestock to an inch of fish per gallon is my rule of thumb.
2. Plenty of hiding places is a must
3. Fish must be compatible and species grouped by size. If you have big
damsels, don't add peaceful species that are smaller or that may compete for
food with them.
http://www.timstropicals.com/sal****...litySearch.asp
4. When? I prefer to add the fish half an hour to an hour before lights
out. At least they get the chance to find a hiding spot before lights-out.
In the dark, residents can travel around the tank easily. Again, there will
always be competition.

For example, I have a Yellow Tang 5 inches long that is the strongest one in
my tank. I added a juvenile Koran Angelfish and for two days the Tang just
beat the heck out of him (no serious damage thou). When I was about to pull
him out, they became the best of friends even sharing the same hiding
places.

I never like to compare fish to humans but as an analogy, this happens
everytime a kid moves into a new school: it takes time to establish
presence. Remember, 99% of these animals is the first time they see another
fish in his feeding ground, at least of the new species.

Another example; my Regal Demoiselle when I introduced a Clarkii Clownfish
she went nuts. The Clown was twice her size but she kept going at it and
following him around the tank. Once the Clown established presence and
fought back, the Regal just stopped. They became good friends. The Clown
died of age and I was looking for another to replace him. Well, I was
buying food for my dog in Petco out of all places I saw a stock of many
juvenile Clarkii. I couldn't believe it and bought 4; there were like 20 of
them. The Tang attacked them for 2 days, the Koran did as the Tang but not
as aggressive. It was amazing that the Regal only kept them away from his
den, she knew them already.

Now I have 6 different species co-existing in a 100 gallons system. I used
the site above to find compatible fish.