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 online magazine for marine aquarists Support our sponsors and mention Reef Central

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


User Tag List

Thread Tools
Old 03/20/2017, 06:01 PM   #1
Registered Member
Join Date: Nov 2016
Posts: 75
Mag question

All my levels have been pretty spot on but in the past I never checked Mag all that often because every time I did it was like 1300-1400. Recently I bought all new reagents for my test kits and tested them all. Alkalinity was 175ppt, calcium was 465ppm, but my mag was at 880!! What creates this situation? I never really added much mag before and the levels seemed to hold. I do weekly water changes and assumed the salt mix was keeping my mag levels good. I guess not!! Any thoughts?

DrewCam is offline   Reply With Quote
Old 03/20/2017, 06:07 PM   #2
Registered Member
AlSimmons's Avatar
Join Date: Jul 2016
Location: California
Posts: 2,253
Testing error perhaps? Make sure to follow the directions to a T and see if you get the same results again. Having somebody else check your Magnesium wouldn't be such a bad idea either.

Last edited by AlSimmons; 03/20/2017 at 06:13 PM.
AlSimmons is offline   Reply With Quote
Old 03/20/2017, 06:57 PM   #3
Registered Member
Join Date: Nov 2016
Posts: 75
I tested more than once and Ive been doing this for awhile. The test kit might be very recently expired but I trust it. The tank is relatively new and doesn't grow coralline algae like I thought it might. Magnesium deficiency makes sense, but I'm just surprised. Never had problems keeping Mg levels pretty good with little effort up until now. Thanks for the response.

DrewCam is offline   Reply With Quote
Old 03/20/2017, 07:24 PM   #4
greengeco82's Avatar
Join Date: Jan 2011
Location: Pittsburg, CA
Posts: 581
It depends on how often you do water changes, and what salt you are using. For example, instant ocean has low levels of mag and reef crystals has high. Also, those testers become unreliable over time. I kept adding mag when my red Sea kit read low, until my tank began to crash. Bought a new kit and mag read extremely high.

Budget reefing is a pipe dream.

Current Tank Info: 190 gallon DSA mixed reef, 2 X 250W metal halides, 2 X 80w T5's, SRO 3000 skimmer, and a few other goodies under the hood
greengeco82 is offline   Reply With Quote
Old 03/20/2017, 07:50 PM   #5
Registered Member
Join Date: Dec 2008
Location: Garden Grove, Ca
Posts: 16,752
If you are making any kind of regular water changes I suspect either a bad test kit or a bad batch of salt.

thegrun is offline   Reply With Quote
Old 03/24/2017, 07:26 PM   #6
Registered Member
Join Date: Nov 2016
Posts: 75
I ordered new reagents for my mag kit but haven't received them yet. Also ordered some ESV magnesium and started adding that. I use Tropic Marin salt and do water changes every 1-2 weeks (10 gallons on an 80 gallon tank). Thanks for the responses.

DrewCam is offline   Reply With Quote
Old 03/27/2017, 07:08 AM   #7
Lou Ekus
Registered Member
Join Date: Nov 2003
Location: Ma, USA
Posts: 34

@DrewCam Mg issues can be sometimes be difficult to track down and diagnose. IF, after you have your water tested and verify your results, you still have questions, give me a call in the office and I'll do my best to help you figure things out. 413-367-0101

Lou Ekus is offline   Reply With Quote

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 03:38 AM.

TapaTalk Enabled

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2018 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 © 2018 DragonByte Technologies Ltd.