Aquaponic Gardening

A Community and Forum For Aquaponic Gardeners

Stephen Eugene Robinson
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  • Rockville, MD
  • United States
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Stephen Eugene Robinson's Discussions

The Nitrogen response

Started this discussion. Last reply by Vlad Jovanovic Nov 26, 2012. 47 Replies

One of the troubles I have had with my aquaponics tank has been nitrogen buildup in the form of nitrates.   Plants need different nutrients to grow.  Limit one nutrient, and that limits the…Continue

Do I actually have to measure for Potassium levels if I am deficient in K?

Started this discussion. Last reply by Stephen Eugene Robinson Dec 3, 2011. 7 Replies

I have been told with some authority that the limiting factor in Aquaponics is Potassium (K).  What this means is that when plants grow, they remove all the K, and can't use the other nutrients. …Continue

Balancing out Nitrates and Potassium

Started Dec 2, 2011 0 Replies

I primarily want to grow tomatos and squash.  I believe I have a deficiency in Potassium, and I have been dosing with 5-10 grams of no-salt most days (KCl).  Truth is, I am dosing blind.  I don't…Continue

Getting a measure on Nitrate

Started this discussion. Last reply by TCLynx Dec 1, 2011. 1 Reply

I don't know if anyone else has mentioned this little trick, but my nitrate level is above what the test kit measures, or even if it isn't, I can't tell thedifference between the top two indicators…Continue


Stephen Eugene Robinson's Page

Profile Information

How did you find us?
a newsletter
Are you an aquaponic gardener already?
If so, what type of system? (pick all that apply)
flood and drain media
How old is your system?
Less than 6 months
What type of fish do you grow with? (select all that apply)
How big is your fish tank?
200 gal
Please tell us something else about yourself.
semi-retired, software engineer,

Stephen Eugene Robinson's Blog

No Amonia or Nitrite (well maybe just a little) but 160+ Nitrate

Posted on August 7, 2011 at 8:52am 8 Comments

My system completed its cycling a little over 2 months ago.  I am raising a nice amount of lettuce and not much else.  I have 25 tilapia in a 180 gal tank.  The fish are 2.5 to 3 inches in length.  They eat like pigs.


The grow bed is 12 sq feet under 600w Metal Halide lighting run for 18 hours/day.


I have just had an infestation of aphids and white fly and am just now regaining control.  While doing this, I pulled my tomato plants and a very healthy canteloupe…


Comment Wall (2 comments)

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At 7:05am on December 9, 2011, Jim S. said…

Hi Stephen,

I'm currently putting my AP setup together and am wandering where you found your water tank.  I am considering an IBS container but would rather have something more like a huge oval shaped Rubbemaid stock tank.

At 4:09pm on July 24, 2011, Gina Cavaliero said…

Welcome Stephen,


Thanks for joining the Aquaponic Gardening community!  I hope you find it a fun place to explore aquaponics.  There is a real blend of experienced and new aquapons in this community, so please don’t hesitate to get in there and start asking questions.  Everyone is quite happy to help out new members – no question is too basic. 


A great place to start is to read the “How to Use This Site” link on the upper right corner, “Start Here” section of the Home page.  You might also find the “Aquaponic Gardening Rules of Thumb” guidelines helpful.


Please participate and check in with us every day!  We are constantly posting news about aquaponics and the good food movement.


Normally Sylvia Bernstein, the community's founder, would be welcoming you, but she is enjoying a well deserved vacation and I am helping out by welcoming new members in her absence.  I am certain she would be excited to have you join and she will be looking forward to getting to know you upon her return.  Thanks again for joining us, and I too look forward to getting to know you.  See you around the site!


Gina Cavaliero


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