02-28-2015, 11:32 AM
Join Date: Oct 2010
Location: The Netherlands
iTrader Positive Rating: 100%
| | Re: 30 ppm of co2 and tanks size
Well, long answer!
On one of my tanks my CO2 goes on a half hour before the lights. pH drops from 7.6 to 6.5-6.6 in half an hour. I've never noticed any ill effects as long as O2 is high enough. This is because pH fluctuation as a result of CO2 is totally different compared to Ph fluctuation as a result of water hardness (KH).
But at the same time, when CO2 is high. CO2 in the fish's blood is high as well. This means it need to get rid of it by breathing faster (or other internal options). This means, high CO2 in the water feels for a fish like sport for humans. You breath faster to get rid of the CO2 and get more O2 in.
Which option would be better? For your fish this is obviously the slow bubblecount. But your not adding CO2 for your fish. For your plants it is important that CO2 is high enough during the entire photo-period, especially already high when the lights turn on. This is easier to accomplish with a higher bubble count, otherwise you need to turn CO2 on 11 hours before lights go on. So the best option to get a reliable idea of your CO2 you need to make a pH profile.
To do this, you do the following;
- Test PH before Co2 comes on. (best after heavy aeration)
- Test PH every hour (or more frequently) between lights on and when lights go off.
- Try to adjust it in a way that it is most constant during the photo period and (depending on your KH) try to aim for an approximate 1 PH unit drop before lights come on.