Stream II Controllable Pump - Model
Sufficient water flow is one
of the most important criteria when
designing a successful reef aquarium.
Closed loops and power heads (stream
pumps) are usually the accepted
way of achieving the needed flow.
Both methods have their advantages
and disadvantages. My personal feeling
is that closed loops require a lot
plumbing, which means pipes running
everywhere, above and below the
display tank. Those pipes take up
space - and space is always in short
Tunze makes the best stream
pumps available, IMHO. Their new
model 6205 push out almost 6000
gallons of water an hour! And they
are controllable from between 30%
and 100% of their capacity. To make
it even better, my new Apex controller
has built-in control capabilities
that make it possible to conjure
up very complex and effective flow
patterns within the tank.
- for aquariums from 800 to 3,000
liters (211 to 792 US gallons)
- flow rate: 5,000 to 22,000 liters
per hour (1,320 to 5,811 US gallons
- energy consumption: max. 55
- voltage / frequency: 100 – 240
V / 50 – 60 Hz
- cable length: 5 meters (16 feet)
- dimensions: diameter 90 mm (3.5
inches), water outlet: diameter
63 mm (1.96 inches)
- magnetic holder for glass or
acrylic up to a thickness of 25
mm (.98 inches)
There are a number of things to like about the Tunze streams. In the advent of
a power outage, the pumps can be run from any 10-24V DC power source.
A, not to be discounted, advantage.
Titanium allow axels, special plastic
bearings, and silicone bearings provide
a very silent operation with little
wear, over time.
The "ball" design
provides a very large intake area which
tends to increase efficiency and, at the
same time, reduces the pumps tendency to
clog up with debris,etc.
The newly designed harness allows a very
large directional range.
Considering all the plus points
offered, I forced myself to look past
the price tag, and bought four of these great flow pumps
for the display tank:
The new 6205s are quite a bit smaller
than the old 6201s and come complete with
a mounting magnet rated at a glass thickness
of just under 1 inch.
The power cord is 16 feet long
- very much needed when the tank is 8ft
long and the cord has to go around a couple
I really like the new shape. The mount
is much stronger than the previous models
and holds the pump solidly through the 3/4"
panes of the display tank.
The clamp mount is also very robust and
allows very smooth adjustment, of the pump,
to almost any position.
The power adapter delivers 24 volts,
and that at over 5Amps!
The speed adjustment allows a variance
between 30% and 100%. I set it at max and
let my Neptune Apex do the controlling -
works really well.
I've been running the
four Tunzes for over a year now. They
were four of the first ten to be
released in the U.S. - accordingly there
were a few minor problems with one of
the pumps. Roger, at Tunze, took care of
the problems very quickly - some of the
best customer service I have
All four pumps are still going
strong, run very quietly, and put out
fantastic flow. I must say, I'm very
satisfied with the purchase.
11/19/2010 - Tunze recently
made changes to the construction of some
of their stream models - among them the