Well I've been watching this fish, and I noticed that it only does the
"shimmering" thing when something invades its spot. The fins are not
clamped, and respiration rate looks good. I did do another water check
after the original post and was amazed to find nitrites. The tank is a
little over a month old, and I had been testing alot to make sure it was
cycled before I added more fish, past the original three. I figure this is
a mini spike? I did add a couple of fish to the tank.

As for a disease, I noticed the dominant fish of the tank drops sideways and
rubs his sides on the sand alot. His fins are not clamped and he looks
rather healthy. What could this be? Or is it just regular
behaviour. -Chris


"Cichlidiot" wrote in message
...
Phil Bassett wrote:
Sounds like shimmering, its a show of agression, my labs do this before
they
chase each other.

This could also be a sign of parasites or disease, which also could have
been brought in with the new pleco. Look at other signs to see if this is
aggression or disease. How are the fins held when this occurs? How is the
respiration rate? Is there any change in color or feeding habits? Does the
fish exhibit any other sort of aggressive behavior towards the pleco such
as attempting to rush it or fin slap it?

If the original poster didn't do this, for future information a new fish
should be quarentined for several weeks to minimize the chance that
diseases are introduced into an established tank.