Macro Nutrients in a stocked Tank - The Planted Tank Forum
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 12-08-2016, 12:43 PM Thread Starter
Planted Member
LFM's Avatar
PTrader: (0/0%)
Join Date: Sep 2014
Location: Canada
Posts: 172
Macro Nutrients in a stocked Tank

Just wondering if dosing with the big 3 (N,P,K) are necessary in a planted tank that is stocked with fish because wouldn't the fish and the food you feed them supply the plants the NPK they require?

Right now I dose with Seachem Flourish, Iron, Excel, Trace and P. I found that my plants did beautifully with Flourish, Iron and Excel alone but I thought I'd give the Trace and P a try just to see what would happen. I didn't bother with N and K because I thought those two would get supplied by the fish for sure but not sure for the P. The only noticeable difference that I found with the Trace and P was that my algae growth rate increased a bit but nothing out of control. I'm guessing it's the P that's causing the increase in algae growth.

So I've decided to just go with Flourish, Iron, Excel, Trace and I'm gonna give this Advance a try.

As a side note I did test my water parameters and the NPK checked out perfectly within parameters and in the proper ratios before I dosed with P.


LFM is offline  
Sponsored Links
post #2 of 3 (permalink) Old 12-08-2016, 12:58 PM
Planted Tank Guru
roadmaster's Avatar
PTrader: (1/100%)
Join Date: Nov 2009
Location: Missouri united states
Posts: 5,576
Much would depend on number of fishes being fed and how often, plant mass, plus light energy being used.(more light/more demand)
I do believe that N and P could easily be achieved for most according to EI ranges which are more than other dosing strategies.
roadmaster is offline  
post #3 of 3 (permalink) Old 12-08-2016, 03:24 PM
Planted Member
elusive77's Avatar
PTrader: (0/0%)
Join Date: Sep 2016
Location: Utah
Posts: 286
I started dosing EI and noticed my Nitrate levels were getting too high, even with the water changes, and my fish were suffering. So I stopped dosing KNO3 and switched to K2SO4 to get my Potassium. I feel like EI or any dosing method should be just a starting point and then adjusted to each individual tank. If you've tested and your levels of N and P are already high enough, then no need to dose them. Just keep testing periodically to make sure they remain that way. And dose anything you're not getting already. Also, keep an eye on your plants. They will let you know if there are any deficiencies.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

elusive77 is offline  


Quick Reply

Register Now

In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome