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Discussion Starter · #1 ·
Ok let's start with the equipment...

125G tank
Rena XP4
10lb pressurized co2 system with electronic regulator and ph controller
External reactor with ph probe mounted before the inlet to the reactor
2X96W CF on for 8 hours per day
4X21W t-5 on for 9 hours per day

Now to the problem...

This tank has been running for about 6 months and up until last week I could get enough co2 in the tank to drop my ph by about 1 and turn the drop checker green/yellow. Normal PH for my tank was 6.5 during lights off and 5.5 during lights on/co2 on. Now my PH will not drop below 5.8 and my drop checker stays a dark green no matter how long the co2 is on. Before the co2 would kick on and get to the desired level and maintain it, only kicking on a few times a day. Now the co2 is running constantly and it seems I cannot get enough co2 into the tank. I refilled my bottle on 09/19/2009 and it was fine for the first week or so. I recently, about 2 weeks ago, did a large trim and removed the jungle that was in my tank. I have not changed anything else and water parameters are all normal including KH(3) and GH(8).

Any suggestions would be greatly appreciated. I am truly stumped on this one but probably just need someone else to point out the obvious to me...haha

Thanks in advance guys and gals....

-T
 

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What kind of regulator? If it is a Milwaukee, look at the other post. Your needle valve could be clogged or dirty.

Why would you want your pH below 5.8? That pH is very low.
 

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Discussion Starter · #3 ·
It's the aquariumplants.com electronic regulator. I can see it pumping co2 into the reactor. Looks the exact same as it did before this problem started. My PH is very low to begin with staying at 6.5 during lights off. I have to go down to 5.5 or 5.6 to get my drop checker to a greenish/yellow color.
 

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Discussion Starter · #5 ·
I don't think it has...water is still exiting the spraybar at the same rate as before. My first thought was that the reactor was clogged in some way but it appears to be fine.
 

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Added anything that could of raised/lowered kh? Removed a powerhead that provided flow maybe? Ph probe still good? Solution in DC?
 

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Discussion Starter · #7 ·
Added anything that could of raised/lowered kh? Removed a powerhead that provided flow maybe? Ph probe still good? Solution in DC?

Nothing added...just removed some plants. Powerhead setup has not changed. PH probe is good and is calibrated. Drop checker has new solution as of last Thursday and still showing same concentration. I am completely lost with this one....
 
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