Anyone has this issue?

**Goalkeeper** · 12th Jan 2017, 19:10

My CO2 checker is green during CO2 period from 2-8 pm daily at 3-4 bps on my 3 feet tank. Noticed it changes to blue in the morning. Believe this is due to surface agitation with my wavemaker running 24/7. Is this normal? Anyone has same situation? Only concern is whether PH fluctuation is too much as shown by the bubble color change? Thanks for any advice.

**SGDiscus** · 13th Jan 2017, 07:15

CO2 gassing off from your tank overnight is normal. That's due to the solubility of CO2 in water.

That is also a reason why many hobbyists have their CO2 start between 30min and 1 hour earlier before the light comes on.

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**Goalkeeper** · 13th Jan 2017, 21:01

Thanks SGDiscus....assume PH flu ritualising no issue in this case?

**Urban Aquaria** · 14th Jan 2017, 15:20

pH change due to Co2 levels usually isn't too much of an issue to most hardy livestock, as long as the changes are gradual and still within safe limits.

It's normal for the drop checker to turn blue overnight as Co2 gas off over time, especially when you have lots of surface agitation which generates more gas exchange.

In the case of my planted tanks, there isn't as much surface agitation (just gentle ripples from the lily pipes), so abit more leftover Co2 stays in the water and carries over to the next day. Hence the drop checker just becomes dark green, instead of blue.

**Goalkeeper** · 15th Jan 2017, 09:01

Thank you UA!

**vinz** · 15th Jan 2017, 12:37

Make sure you have at least 2KH in your tank. It reduces the amount of pH changes due to CO2 degassing.

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**SGDiscus** · 15th Jan 2017, 12:53

Agree with UA.

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**aza** · 15th Jan 2017, 18:09

Don't worry Goalkeeper. As long as your lifestock can adapt to the little fluctuations, that is you don't see them near the surface gasping for oxygen, it should be fine. I have similar experience with you regarding this fluctuation in CO2 during the day before lights on currently and everything is okay for my fishes here.

**Goalkeeper** · 15th Jan 2017, 18:55

Thanks aza. I haven't been successful with amano shrimps. Noticed they gradually go "Mia" after a while. That's why I'm wondering if shrimps are more susceptible to PH fluctuations. All my other fishes are doing well! When I recently rescape my tank, I found only one survivor of the >20 I've bought!

**aza** · 15th Jan 2017, 23:52

Originally Posted by Goalkeeper

Thanks aza. I haven't been successful with amano shrimps. Noticed they gradually go "Mia" after a while. That's why I'm wondering if shrimps are more susceptible to PH fluctuations. All my other fishes are doing well! When I recently rescape my tank, I found only one survivor of the >20 I've bought!

I can't seem to find my Amano in my tank too. But I guess they are alive and kicking as algae is at bay, fish droppings get removed the morning after and from leftover exoskeleton remains of their molting.

And of course one or two will jump so I top up a bit from time to time since they can only breed in brackish water.