Go Back   Aquarium Advice - Aquarium Forum Community > Freshwater > Freshwater & Brackish - Planted Tanks
Click Here to Login

Join Aquarium Advice Today
Reply
 
Thread Tools Search this Thread Display Modes
Please support our sponsors and let them know you heard about them on AquariumAdvice.com
 
Old 12-05-2005, 01:30 AM   #1
Aquarium Advice Freak
 
Join Date: Jul 2005
Location: Perth. Western Australia
Posts: 274
Send a message via AIM to fastfly48 Send a message via MSN to fastfly48 Send a message via Yahoo to fastfly48
Why is my Kh dropping?

Hello all.

Ok, heres the story...
My Kh from the tap is 80ppm, plenty hard, and my Ph from the tap is 7ppm...perfect.
However, In my tank (thats full with the water from my tap...) my Kh is only 40ppm and Ph is drastically swinging from 6 to 7ppm.

I'm injecting C02 at a very slow rate, just under a bubble a secind...because any higher and my Ph drops too much.
I haven't added any Kh buffers at all...though I did just take out a phosgaurd filter insert from my filter. Could that have affect the Kh much? I *think* that maybe the phosgaurd lowered my Kh...So I'm hoping now that It's (phosgaurd) gone that my Kh will/should rise and be the same as the Kh from my tap (80ppm)...which would make sense!

So with my low Kh, at the moment, it's making it really difficult to get much C02 in the tank with out crashing my pH...

Any ideas?

Thanks in advance.
Ry.
__________________

__________________
My tank:
20 gallon planted freash water (26*C) community. 30" long, 12" deep and 12" high. 40W lighting = 2 watts per gallon..
otb aqua clear filter
Pressurized C02
fish: 8 neon, 4 rosy barbs
, 2 brs. pleco
Shatered dreams of yesteryear, cloud horizons in shades of grey.
fastfly48 is offline   Reply With Quote
Old 12-05-2005, 09:20 AM   #2
Moderator Emeritus
 
Purrbox's Avatar
 
Join Date: Jun 2005
Location: Iowa USA
Posts: 5,860
The Phosgard should only be removing Phosphates which can buffer the water but are not read as a part of the KH test. There must be something else in you water that is causing the KH to change. Since you are injecting CO2, you probably have a high light setup. What is you fertilizing schedule? I'm guessing that your plants are grabbing nutrients from you KH as a result of not getting enough of one of the ferts that they need.
__________________

Purrbox is offline   Reply With Quote
Old 12-05-2005, 10:53 AM   #3
Aquarium Advice Addict
 
Join Date: Dec 2003
Location: Nebraska, USA
Posts: 6,703
First off, pH isn't measured in ppm, so don't put that after your pH readings

How often are you doing water changes, and in what volume? A 50% change once a week is the norm for planted tanks. Kh shouldn't dip rapidly. Usually it drops over the course of a couple months when water changes aren't done, the CO2 creates carbonic acid which breaks down the carbonate molecules, lowering Kh.

Otherwise, Valisneria sp. can also leech carbonate from the water colum, especially if they are lacking calcium. What's your Gh like in the tap and in the tank?
__________________
Former advisor and planted tank geek...life's moved on though.
malkore is offline   Reply With Quote
Old 12-05-2005, 10:59 AM   #4
Aquarium Advice Freak
 
Join Date: Jul 2005
Location: Perth. Western Australia
Posts: 274
Send a message via AIM to fastfly48 Send a message via MSN to fastfly48 Send a message via Yahoo to fastfly48
Thaks guys.
I'm doing about 50% a week of water changes...though more like two 25% changes than one big 50% one. That's alright right?
What's Gh? I doubt I have a test for it if I don't know what it is! Phosphate i guess?

Keep me up to speed!
Cheers.
Ry.
__________________
My tank:
20 gallon planted freash water (26*C) community. 30" long, 12" deep and 12" high. 40W lighting = 2 watts per gallon..
otb aqua clear filter
Pressurized C02
fish: 8 neon, 4 rosy barbs
, 2 brs. pleco
Shatered dreams of yesteryear, cloud horizons in shades of grey.
fastfly48 is offline   Reply With Quote
Old 12-05-2005, 12:34 PM   #5
Aquarium Advice Addict
 
Join Date: Dec 2003
Location: Nebraska, USA
Posts: 6,703
Gh= General Hardness (everythign else that adds to hardness of water, aside from Kh/Carbonate hardness)

Phosphate is P04.
__________________
Former advisor and planted tank geek...life's moved on though.
malkore is offline   Reply With Quote
Old 12-05-2005, 10:29 PM   #6
Aquarium Advice Freak
 
Join Date: Jul 2005
Location: Perth. Western Australia
Posts: 274
Send a message via AIM to fastfly48 Send a message via MSN to fastfly48 Send a message via Yahoo to fastfly48
thanks Malkore.
Sorry, I forget to give you my Fetilizing schedule...
I just add AZOO Chelated Ferrite Liquid every week with my water change.
On the bottle it says it's made of organic ion (not iron) complex...?

Ry.
__________________
My tank:
20 gallon planted freash water (26*C) community. 30" long, 12" deep and 12" high. 40W lighting = 2 watts per gallon..
otb aqua clear filter
Pressurized C02
fish: 8 neon, 4 rosy barbs
, 2 brs. pleco
Shatered dreams of yesteryear, cloud horizons in shades of grey.
fastfly48 is offline   Reply With Quote
Old 12-07-2005, 08:35 PM   #7
Aquarium Advice Regular
 
Join Date: Jun 2005
Location: Charlotte
Posts: 60
Do you have a piece of driftwood that might be affecting the kh?
__________________
Tank: 48G bowfront with fluorite & aquarium gravel
Lighting: 1x96w 6700k pc 10hrs
Co2: pressurized, Rio pump & reactor,
Fauna: gold nugget pleco, otto (3), leopard danio (4), zebra danio (4), hatchets (4), white cloud danio (4), ghost shrimp (4)
Flora: balansae, grn wendtii, red wendtii, tiger lotus, narrow leaf chain sword, java fern,
anubias pygmy, anubias barteri, anubias coffeefolia, dwarf sag, corkscrew val
Filtration: Rena XP3
kristap is offline   Reply With Quote
Old 12-07-2005, 11:22 PM   #8
Aquarium Advice Addict
 
Join Date: Dec 2003
Location: Nebraska, USA
Posts: 6,703
You know, I re-read your post. Just under a bubble per second? That's actually a pretty high CO2 flow. I run less than that, and my Kh is 160ppm.

I think you need to turn down the CO2 to about 1 bubble per 2 seconds, or 30 per minute.
__________________

__________________
Former advisor and planted tank geek...life's moved on though.
malkore is offline   Reply With Quote
Reply

Please support our sponsors and let them know you heard about them on AquariumAdvice.com

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
just dropping by to say... hollywoodheidi Member Introductions 8 10-20-2007 09:31 PM
Dropping KH caribou Freshwater & Brackish - Planted Tanks 9 03-02-2006 11:06 PM
I have not been dropping by too much lately but... DragonForce Saltwater & Reef - Getting Started 10 01-25-2006 08:21 PM
pH keeps dropping! ieod Freshwater & Brackish - General Discussion 2 08-19-2004 02:10 PM
My Ph is dropping and I don't know why? clownfish Saltwater Reef Aquaria 7 10-14-2003 10:34 AM







» Photo Contest Winners








Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -4. The time now is 10:40 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.