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

User Tag List

Reply
Thread Tools
Old 12/29/2016, 03:30 PM   #1
dodgy67
Dave
 
dodgy67's Avatar
 
Join Date: Dec 2014
Location: Leighton Buzzard UK
Posts: 112
Magnesium not dropping

I raised my mag levels about two months ago in both my tanks (a 60gall and 20gall) to just over 1600 to help combat some algae problems using Magnesium Chloride Hexahydrate and Epsom Salts, both tanks are now joined together corals are thriving, 10 large clumps of Halimda, I dose Kalkwasser using a ph meter and Bicarbonate of Soda to maintain Ca and Alk..

Mag is still testing over 1600, any ideas why this is not depleting over this two month time period

Tank 1 60gall
Tank 2 25gall
Sump 25gall
ph 8.4 - 8.5
Alk 10-11
Salinity 1.025
Nitrate 0.0
Phosphate 0.02


dodgy67 is offline   Reply With Quote
Old 12/29/2016, 03:45 PM   #2
Sk8r
RC Mod
 
Sk8r's Avatar
 
Join Date: Feb 2006
Location: Spokane WA
Posts: 33,348
Blog Entries: 55
Oceanic salt, eg, has a very high mg content. Take a look at your salt mix and see if it's just naturally high: if nothing is using it up and you're continuing to do water changes with high mg salt, it can be real hard to change. I switched to Instant Ocean because of this problem.


__________________
Sk8r

Salinity 1.024-6; alkalinity 8.3-9.3 on KH scale; calcium 420; magnesium 1300, temp 78-80, nitrate .2. Ammonia 0. No filters: lps tank. Alk and cal won't rise if mg is low.

Current Tank Info: 105g AquaVim wedge, chromis, royal gramma basslet, tailspot blenny, ocellaris clown, RBTA, signal goby, yellow watchman, red firefish, chestnut turbo snails, bristleworms, couple of hermits.
Sk8r is offline   Reply With Quote
Old 12/29/2016, 03:59 PM   #3
dodgy67
Dave
 
dodgy67's Avatar
 
Join Date: Dec 2014
Location: Leighton Buzzard UK
Posts: 112
Magnesium not dropping

Sk8r not done a water change in two months only a small top up due to salt creep loss when sal dropped to 1.023


dodgy67 is offline   Reply With Quote
Old 12/29/2016, 07:09 PM   #4
bertoni
RC Mod
 
Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 87,900
Magnesium often is consumed in very small amounts. My tanks never required magnesium supplementation due to consumption, although they ran for more than 10 years. 1600 ppm probably is safe enough, but you probably would need to do water changes with a lower-magnesium product to drop the level in any reasonable time frame.


__________________
Jonathan Bertoni
bertoni is online now   Reply With Quote
Old 05/20/2019, 10:54 AM   #5
tmann51
Registered Member
 
Join Date: Jul 2008
Location: Wisconsin
Posts: 8
Un readable magnesium levels

A few months ago I checked my magnesium levels and found them to be low. I started adding BRS mag for two part dosing and monitoring the levels. I'd been using Salifert test that was not expired. I switched to Red Sea magnesium test and discovered my adjusted levels to be off the scale, over 1600! All my water pumps are regularly locking up and my Osmolator also malfunction. I'm also having to dose large amounts of calcium and alkalinity daily. 20 percent water changes weekly have not moved to readable levels. Any help would be appreciated. I'm using Red Sea Pro salt currently.


tmann51 is offline   Reply With Quote
Old 05/20/2019, 10:27 PM   #6
bertoni
RC Mod
 
Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 87,900
You probably can get a reading by using two syringes for the final titration, and adding the results. I'd increase the water change rate, if that's not too much work or cost. To cause that kind of problem, I'd expect the magnesium to be extremely high. What is the magnesium level in the freshly-mixed saltwater?


__________________
Jonathan Bertoni
bertoni is online now   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 08:34 PM.


TapaTalk Enabled

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2019 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
User Alert System provided by Advanced User Tagging v3.3.0 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.