Tunze 9211

[tonyg520]

I think I have a somewhat low ph because of high co2 levels. I read that sometimes an airline running from fresh outside air to the skimmer will help. Is this even an option given the passive nature of this skimmer? Would there be enough water exchange to make this worthwhile? If so, how do I make the tubing connection to the skimmer itself?

 

[deanearp]

Do you know where the high CO2 levels are coming from? Have you used a buffer solution to try and protect against pH changes and to raise the pH?

 

[tonyg520]

I haven't used any buffers yet. When I do a water change, the ph will be higher for only a short time, then it falls back down within a day. It ranges from around 7.90 +/- 0.5 at lights on, to 8.10 +/- 0.5 at lights off. Thats with an 8.5 hour photo period and 13 hour reverse on fuge. I notice higher values when I leave the canopy hood cracked and cabinet doors open, and even higher values when weather outside forces our heat to run more often. On mild days when the heat hasn't come on much at all, the numbers are at their lowest. I just thought it would be good to try to get the ph up via gas exchange, if that was indeed the problem.

 

[rvitko]

You can connect a small airpump to the ozone input nipple on the skimmer under the cup, you will want to add about 200l/hr of air from outside so the airpump should have 150-200l/hr of performance. It will work as by diffusion the gases will equalize, though it will be slower.

 

[tonyg520]

Is that the larger of the two nipples that are under the cup?

 

[rvitko]

The smaller one, regular airline size, the larger one should be left open as a vent.

 

[tonyg520]

Thanks!