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PostPosted: May 27th, '19, 12:12 
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I was hoping someone could give me advise on this issue I’m having. Little info on the system. It’s approximately 200 - 300 gallons with currently 8 goldfish. The system is about 3 months old.
Ph 7.5
Ammonia 0
Nitrite 0
Nitrate 0
I’m growing about 100 strawberry plants in a nft style but it’s more of a constant flow design since I had the water set high in the pvc till the roots are well Established.
System has been doing great until about 1 1/2 weeks ago. I noticed the plants growth has been slowing down and the leaves on just about all the plants new growth have changed to a light green color with the veins staying green. I was thinking iron issue so I added iron. No change. I also sprayed the leaves with liquid iron 2 days in a row. No change. What else would cause this?
I have been adding fish waste to the system from my swirl filter in my tilapia tank a few days a week until the rest of my goldfish come out of there quarantine tank. I was thinking low nitrogen since the nitrates are 0. But the leaves look like low iron to me.
Any suggestions would be great!
Thanks.


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PostPosted: May 27th, '19, 18:46 
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Top pic looks like it could be Magnesium, or possibly Calcium. Bottom pics do look like either Iron or Nitrogen, depending on where they are on the plant. What type of Iron have you added?

As you are obviously aware, 8 goldfish is nowhere near enough for the amount of plants you have, so you likely have a shortage of numerous nutrients.

For a short term fix I would initially add 4 or 5 capfuls of Maxicrop over a 24hr period, then a couple of capfuls every 3-4 days until you get more fish. Don't add them all at once, especially as you have a pH of 7.5, as Maxicrop contains Ammonia and by adding each capful a few hours apart, the system will be able to take care of it, so it doesn't get to toxic levels.

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PostPosted: May 28th, '19, 01:11 
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The iron i’m Using is DTPA cleated iron 10%.
Would this be the right maxicrop to add in?
https://www.amazon.com/Maxicrop-1-Liter ... 3035110011

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PostPosted: May 28th, '19, 14:30 
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DTPA Iron starts becoming less available to the plants as the pH climbs into the low 7's, and is ineffective at a pH of 7.5 or higher. The best chelated Iron for high pH systems is EDDHA, it's plant available across a very wide pH range, supposedly from a pH of 3 all the way up to a pH of 11.

That Maxicrop would do. Even the regular version, without added Iron, would be fine.

The DTPA Iron you've added will slowly become available to the plants as the pH in your system naturally declines. You'll probably find that it is already being taken up by the plants, just not as quickly or effectively as EDDHA, as there will likely be areas within your gravel beds (if you have any) where the pH may be lower than the 7.5 of the water.

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PostPosted: Aug 9th, '19, 05:42 
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Hi,

Looks like iron deficiency mostly.
How much DTPA iron did you add ?

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PostPosted: Aug 9th, '19, 22:16 
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+1 on lack of iron being the culprit. See if the DTPA iron has instructions for a spray application - this will avoid any pH lockout problems that are preventing the DTPA iron from being available.


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PostPosted: Aug 9th, '19, 23:27 
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You need a very high pH for DTPA to be unavailable.
See this chart :
https://d33v4339jhl8k0.cloudfront.net/docs/assets/536fb913e4b03c6512282450/images/5583e765e4b027e1978e91fb/file-TjRiGNYWdw.png

DTPA is almost fully available @ pH 7.5 and still 50% available @ pH 8.0

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PostPosted: Aug 12th, '19, 01:29 
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Well a better way to phrase that would be to say that you'd need a very high pH for Fe-DTPA to become totally unavailable. It actually starts having reduced availability at around pH 7.0. Sebz is right though and there should be enough if enough was added in the first place (I figure 60 to 80 percent available at pH 7.5 but this is just an estimate, the charts vary a bit). A spray application might give a bit faster results but either method of addition should work. Either way you'll probably have to repeat the application based on how the plants look.


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