It is about time that we had some real fish chat going again on this list
so I will start the ball rolling with something that I noted yesterday in
my tanks.
I have had for some time now a large coen tri in my 3' tank, there are
three smaller goyder tri's in there with him. The largest goyder has not
shown all that much colour, that has been left to one of the smaller
goyders and the coen. Yesterday I added two fish to the tank, a 3"
Kangaroo ck duboulay and a wonga creek tri. The effect was immediate, the
duboulay and the largest goyder started flashing at each other and mock
battles abounded. At times there were up to four way contests going on in
the tank as dominance was sorted out again. I will be interested to see
what has happened during the day today and what is going on tonight when
I get home. Has anyone else seen this sort of stable colour suppression
in a tank and then rapidly altering due to an addition to the tank? I do
not imagine that it would be all that rare. I have observed that sort of
behaviour in tanks at shops that have a single species in a tank, perhaps
Bruce would be able to comment about what a school behaves like in these
sort of circumstances.
The tank perameters are as follows, NH3, NO2=0, NO3=5ppm, temp=25, pH=7.0
kept with a pH controller with CO2 at about 12ppm, O2=saturating from
2hrs after lights on, 100watts flouro light, 150ppm gH.
Peter Hughes