7094 question on tide simulation

[ReefHobbyist]

I am looking at using 2 stream 6000s with a 7094 controller on a 120 gal sps dominated tank.

On the tunze website the tide simulation (F) states the pumps are switched on or off alternately. Can it be set to alternate between 30-100% without the pumps shutting off? I.e. When pump one is at 100% pump two is at %30. Then they alternate.

I am concerned with these pumps being completely off for any length of time since they appear to be open in the front. Wouldn't that be an issue with fish/snails?

The alternate approach would be a single 6000 with wave simulation (B). Would this give effective back and forth motion even though it is pumping from one direction?

Thanks,
Scott

 

[rvitko]

If you use wave simulation and program channel 1 to be at 30% and channel 2 to be at 100% and then a few seconds later switch to Channel 1 100% and channel 2 30% you would get the effect you want. The opening is divided by a crosshatch into 1/2" openings. Most fish will not enter the pump because it is not dark inside. Stomatid snails though do cause problems and I have had one customer report a broken drive unit caused by stomatid snails entering the pumps at night. Stomatids are the black snails with the half shells.

 

[ReefHobbyist]

Thanks for the reply. If I set up the 2 pumps as you described are is the timing between the 2 synch'd? Or could they drift over time such that they may both be on 100% at some point?

Could you answer the alternate question?

The alternate approach would be a single 6000 with wave simulation (B). Would this give effective back and forth motion even though it is pumping from one direction?

Thanks,
Scott

 

[rvitko]

In a 4ft tank their should be some back and forth motion from a 6000. Two pumps would be preferred, but both don't need to run at the same time. The timing would by synchronised.

 

[ReefHobbyist]

Thanks very much!

Scott