Should the drop checker turn blue overnight?

[Surya]

I have just started using pressurised CO2 on my 125l Juwel Rio tank, via an in-tank Twinstar diffuser. 6 hrs of lights on, 4-10pm, with CO2 on 2hrs before the start and off 2hrs before the end, 2bps for whatever that's worth. There is an in-tank drop checker with brand new CO2 Art premixed drop checker solution.

On the first day it went from blue to lime green after a few hours (3-4), as expected. However it's just stayed green since, throughout the 24hrs.

Fish and shrimp all seem absolutely fine. There is lots of surface movement. (No air pump).

Is this a problem? If it means there is CO2 being retained throughout the 24hrs, will it harm the fish long term if they seem OK?

 

[Mike Singh]

I don’t think it would. As long as the animals continue to be ok. You could try to reduce to 1bps and see the effect.

 

[Scaperinc]

Try raising the lily pipe/outlet for the night and see what happens next morning

 

[G H Nelson]

Try raising the lily pipe/outlet for the night amd see what happens next morning

You could slow the Co2 injection bubble count to 1 BPS...
and monitor the Co2 Drop checker!