Reef Central Online Community

Home Forum Here you can view your subscribed threads, work with private messages and edit your profile and preferences View New Posts View Today's Posts

Find other members Frequently Asked Questions Search Reefkeeping ...an online magazine for marine aquarists Support our sponsors and mention Reef Central

Go Back   Reef Central Online Community > General Interest Forums > The Reef Chemistry Forum
Register Blogs FAQ Calendar Mark Forums Read

Notices

Reply
Thread Tools
Old 06/19/2017, 08:14 AM   #1
Brockly
Registered Member
 
Join Date: Mar 2017
Posts: 15
Alkalinity boost help

Help with alkalinity.

Any thoughts on this...
I have a 20 gallon coral Qt. It has just a sponge filter and rack in it. Has about 15 small coral frags. 1/2 zoanthids 1/2 sps. Lit with mars aqua

My salinity was 1.026, magnesium was 1330, calcium 400, dkh was 7.5

I wanted to boost dkh up so dosed 20 ml 1ml/g)of just the alk part of 2 part which said it would raise dkh by 2. I also dosed 2 quart of kalkwasser as top off thst day. 24 hours later instead of having the expected 9.5 dkh its was 7.6?

Why did it not raise?


Brockly is offline   Reply With Quote
Old 06/19/2017, 04:18 PM   #2
outssider
Registered Member
 
Join Date: Nov 2009
Location: Reseda, Ca.
Posts: 1,215
my bet is that it precipitated out mainly because the kalk raised the ph. check the calcium, that should be lower too! did you use sodium carbonate or bicarbonate ? sodium carbonate will raise the ph even more and increase the chance of precipitation. try dissolving bicarbonate (baking soda) in ro/di water and dripping it slowly into the frag tank no kalk.


outssider is online now   Reply With Quote
Old 06/19/2017, 11:12 PM   #3
Brockly
Registered Member
 
Join Date: Mar 2017
Posts: 15
My 2 part is made of soda ash so carbonate. I use thst as my ph is always 8.2 ish(I can't tell the difference between 8.25 and 8.3 on salifert doh test) I checked the calcium and it wasn't really lower then I expected. It was 390 but I have a hard time maintaining it at 420 as I use instant ocean and it is so low on everything. (I need to switch) do I drip the baking soda the same as kalk. 1 teaspoon per half gallon of rodi water?

I have had the tank up for 2 months and have yet to get a stable alk calcium and mag, it's been pretty frustrsting


Brockly is offline   Reply With Quote
Old 06/20/2017, 01:24 AM   #4
karimwassef
Registered Member
 
karimwassef's Avatar
 
Join Date: May 2004
Location: Dallas, TX
Posts: 10,304
I keep my Mg over 1500 to minimize precipitation at high pH 8.3 and high Ca >550 without compromising dKH - keeping it above 9 now...

Also, time is important. Drip in very very slowly.


__________________
Failure isn't an option It's a requirement. 660g 380inwall+280smp/surge S/L/Soft/Maxima/RBTA/Clown/Chromis/Anthias/Tang/Mandarin/Jawfish/Goby/Wrasse/D'back. DIY 12' Skimmer ActuatedSurge ConcreteScape
karimwassef is online now   Reply With Quote
Old 06/20/2017, 09:26 AM   #5
tmz
ReefKeeping Mag staff

 
tmz's Avatar
 
Join Date: Apr 2006
Location: West Seneca NY
Posts: 27,580
Precipitation is the likely cause; primarily from too much alk.

I use instant ocean and it is so low on everything. (I need to switch)


It's not actually; see this sticky:

http://www.reefcentral.com/forums/sh....php?t=2554264

Try post #18 as a start.


__________________
Tom

Current Tank Info: Tank of the Month , November 2011 : 600gal integrated system: 3 display tanks (120 g, 90g, 89g),several frag/grow out tanks, macroalgae refugia, cryptic zones. 40+ fish, seahorses, sps,lps,leathers, zoanthidae and non photosynthetic corals.
tmz is offline   Reply With Quote
Old 06/20/2017, 02:10 PM   #6
PAXpress
Registered Member
 
Join Date: Nov 2015
Posts: 318
Quote:
Originally Posted by Brockly View Post
Help with alkalinity.

Any thoughts on this...
I have a 20 gallon coral Qt. It has just a sponge filter and rack in it. Has about 15 small coral frags. 1/2 zoanthids 1/2 sps. Lit with mars aqua

My salinity was 1.026, magnesium was 1330, calcium 400, dkh was 7.5

I wanted to boost dkh up so dosed 20 ml 1ml/g)of just the alk part of 2 part which said it would raise dkh by 2. I also dosed 2 quart of kalkwasser as top off thst day. 24 hours later instead of having the expected 9.5 dkh its was 7.6?

Why did it not raise?
You may want to try baking soda mixture instead, I had constant problems with alk staying above 7.5 and constantly falling back to 5.9 or lower and the baking soda helped a lot (along with a complete clean out of my sump). Check out this link http://www.reefkeeping.com/issues/2006-02/rhf/ Specifically this tidbit:
" Recipe #2, Part 2: The Alkalinity Part

Dissolve 297 grams of baking soda (about 1 1/8 cups) in enough water to make 1 gallon total. This dissolution may require a fair amount of mixing. Warming it speeds dissolution. This solution will contain about 950 meq/L of alkalinity (2660 dKH). As mentioned earlier, Arm & Hammer is a fine brand of baking soda to use in these recipes. Be sure to NOT use baking powder. Baking powder is a different material that often has phosphate as a main ingredient.

Once these two solutions are created, they can be added as frequently as necessary to maintain calcium and alkalinity. For further dosing instructions, see below. "


You don't have to mix this much total, but a small amount would raise the alk steadily. Also you don't want to bake it because it will turn the baking soda into sodium carbonate instead and will raise the ph. You want the actual baking soda I believe and precipitation will not be as much of an issue.


__________________
Visit my youtube channel to see my tanks! https://www.youtube.com/channel/UCSR-zK-vmMShByAFT5hBRmA
PAXpress is offline   Reply With Quote
Reply

Thread Tools

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 On

Forum Jump


All times are GMT -6. The time now is 05:24 PM.


TapaTalk Enabled

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2017 Axivo Inc.
Use of this web site is subject to the terms and conditions described in the user agreement.
Reef CentralTM Reef Central, LLC. Copyright 1999-2014