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CO2 question

Maximum

Member
Joined
15 Jan 2014
Messages
32
I know, it's yet another CO2 question but I cannot find the answer!
Set up pressurised CO2 about 3 weeks ago and although I am still adjusting bps and switch on and off times it appears to be working fairly well.
Normal tank water before CO2 was pH 8.0 or even up to 8.2 - hard water, Bedfordshire.
Since adding CO2 pH is never higher than 7.8 and the last 2 days has been 7.5 in the morning even though I have an air stone running between 1-4am. Nothing else has changed in the tank.
As I have very hard water I was not expecting the pH to drop very much but it has been down to 6.9 with the gas on.
Should I be looking for a pH drop of approx 1.0 based on pH 8.0 or a drop to about 6.5 based on the "new" tank pH of 7.5?
I suspect I do not have enough CO2 in the tank but the effects on the plants are good, clean growth and the fish are fine but like most beginners I am twitchy about over doing the gas!
Hope someone can point me in the right direction - many thanks.
 

Tim Harrison

Administrator
UKAPS Team
Joined
5 Nov 2011
Messages
8,644
Location
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There is no need to worry about the pH drops associated with CO2. I live in MK so very similar water parameters, and mine does the same, and all is good:) Just keep an eye on your drop checker, you're aiming of lime green with 4dkH solution at, or soon after, lights on...and then all the way to the end of the photoperiod...http://www.ukaps.org/index.php?page=co2-measurement-using-a-drop-checker
 

Maximum

Member
Thread starter
Joined
15 Jan 2014
Messages
32
Thank you Troi for your reassurance! My drop checker is lime green and is in the area of least flow so hopefully I am getting there - just need to get the balance now.
 

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