Jump to content

Alkalinity fluctuations

Recommended Posts

30 gallon nano with fish, lps, softies, and a few sps.  Established for a year and now lots of coralline algae.  I have recently started to dose with two parts.  


but my dKh is shifting between 7.7 and 10.5, sometime more than a whole point in a day.  Should I be concerned?  


I have a calcium reactor on order.  This should help tremendously, right?

Share this post

Link to post
Share on other sites

Mg at 1050 to 1150  I have been adding magnesium but cannot get the level further up.


Maybe I should bump it up heavier to raise up to 1350.


I have to agree that it takes a lot of dosing to raise magnesium.  Bulk Reef Supply has a calculator on their site to figure out how much you need to add to reach your desired level.  Here's a link.  http://www.bulkreefsupply.com/reef-calculator/ The downside is that it only works for certain types of supplements.  Other brands usually give you a formula to use, too.  I remember being shocked at how much Brightwell I needed to add to bump my mg to where I wanted it.


To your original question, I would say that a fluctuation from 7.7 to 10.5 in a day is huge.  I'm not sure your low mg could account for that kind of swing.  Maybe think about testing each water sample with two different test kits for at least a few days to make sure your readings are accurate.  Also, I know others may disagree, but I would say that keeping alkalinity levels stable is more importing than getting to the exact number you want to reach--so I think you're doing the right thing in pursuing that first.


Lastly, my calcium reactor was a bear to get dialed in--mostly because of my inexperience in using them.  Now that I have it dialed in, it's heaven.  That said, my tank is on the large side.  I think most people with a nano just dose, or even just do regular water changes, to keep their levels in check.  You might find the bang isn't worth the buck with the calcium reactor. 


I really do think that you are doing the right things--testing, working on getting things stabilized, and reaching out here to get others' thoughts.  Keep at it!

Share this post

Link to post
Share on other sites

Here's an online reef calculator I use. It have many different types of additives to choose from.



For Mg, I use half Epson Salt (magnesium sulfate) and half MgCl. If in a pinch and out of MgCl, it's ok to use just Epson Salt. Dissolve in RO water. It'll take some mixing to get it all to dissolve.


Sent from my SAMSUNG-SM-G935A using Tapatalk

Edited by danlu_gt

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now