Two questions - pH and Ca related - The Planted Tank Forum
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 03-24-2007, 10:36 AM Thread Starter
Algae Grower
PTrader: (1/100%)
Join Date: Mar 2007
Location: Allentown, PA
Posts: 25
Two questions - pH and Ca related

First - The last few times I have checked my GH from the tank, it was around 16-18. I have started since adding Mg, as I am trying to figure out the deficiency in my tank.

My question it possible that even with a high GH, Ca dosing may be necessary? My city's water report states:

Alkalinity mg/L as CaCO3 176
Total Hardness grains per gallon 13.7
These additional analyses had non-detectable results in 2005: Copper, Iron, Manganese and Silver

************************************************** *******

Second - pH readings to determine CO2 levels (pressurized).

I have Seachem's and another brand pH readers/indicators hanging in the tank (one on each side), also API's test kit, and a drop checker (5 dKh water).

Each one tells me something different. Seachem's reads 8.6 (it hasn't changed since I put it in and it is the second one that has done this). The other reads 6.8 and heck if I have seen it change except when I initially put it in.

The test kit reads 7.0 - 7.2 (never greenish at all). My drop checker I can get green - will change to blue by morning with Emperors running.

Which one do I believe?
Asty is offline  
Sponsored Links
post #2 of 3 (permalink) Old 03-24-2007, 06:57 PM
Planted Tank Enthusiast
KevinC's Avatar
PTrader: (6/100%)
Join Date: May 2004
Location: Oshkosh, WI
Posts: 738
Regarding the Ca: Chances are extremely good that the majority of your GH is due to Ca, so you shouldn't need to add any. It is also very unlikely that you have a Mg deficiency with that high of GH - though it is possible.

Regarding the pH: If your 5dKH solution is accurate, trust the drop checker. With a precisely-made solution, it is far more accurate for CO2 than the pH indicators. Otherwise I'd suggest a pH meter.


72g bowfront planted, CO2, 4x - T5HO, Eheim 2213 and 2217, 2 angels, pristella tetras, blue tetras, betta, albino bristlenose pleco, albino cories. Sword, vals, hygros, ludwigias, java moss and fern, anubias

2g Mac-quarium. Clown gravel, fluorescent plastic plants, and 2 guppies.
KevinC is offline  
post #3 of 3 (permalink) Old 03-25-2007, 05:04 AM Thread Starter
Algae Grower
PTrader: (1/100%)
Join Date: Mar 2007
Location: Allentown, PA
Posts: 25
Thank you Kevin...that is what I thought also, on both accounts.
Asty is offline  


Quick Reply

Register Now

In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome