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I am around 4 months into my Aquaponics project.  Reading this AM were as follows:

Temp 80

Ammonia 0.50 PPM

Nitrate  0

Nitrite  0

PH 6.0

I added a grow light to my green house about 4 weeks ago and my plants are growing very well now.  I should be producing blooms but none of the plants are.  Any advice would be helpful! 

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First, what test kit are you using (I ask since the API kit only reads down to 6 and if it reads 6 it could be anything lower and you have no way of knowing?)  Are you certain your pH is not way below 6?  Seeing ammonia start to climb while pH could be falling could be the first sign of a possible pH crash and bacteria stall out.  You may need to buffer your pH back up a little bit so you can be certain that it hasn't dropped way off the chart.

To get blooming often the light needs to be even more and actually in hydroponics they will recommend changing the color temperature of the lighting for blooming sometimes too.

But in a new aquaponics system, sometimes you are just still lacking some of the other nutrients and giving a dose of seaweed extract has helped people get plants to start blooming in some cases.

Is this a media based system?  What type of lights and how long are you running them for?  And why did you decide that you need lights in a greenhouse?  I suspect that your first problem has to do with low nutrient levels - zero Nitrates means that the plants are probably taking up all the nutrients from the fish waste - but you could also be having, or causing, a problem with your lights.

After I hit Add Reply I saw that there were pictures so some of my questions were answered there.  Looks like a beautiful, but highly shaded, setting. You seem to have daylight spectrum T5's, which only throw light about 18" into the canopy of your plants.  You are going to be challenged getting enough light into your entire grow bed to fruit with given that issue.  I recommend lowering that light down until it is practically right on top of your tallest plant.  If you can afford it getting another fixture to get even more light down there.

Also adding more fish would be a very good idea!

I am adding seaweed about once a month.  I am using a API test kit. Low ph could be a problem so I will try to increase the PH a bit.

Hydrofarm FLT24 2-Foot Four Tube T5 Fluorescent Grow Light System is the lighting system and I have it on a timer and it is on 12 hours a day.

I added the light because the position of the green house only allowed around 6 hours of direct sunlight and the plants were yellowing and not growing before I added the light.

Also, this is a media based system.

Yea, bring pH up till you can see that it is in the green.

The T5 grow lights are great for growing lettuce and other compact plants that are all the same height (since you have to have the light practically sitting on the plants.)  Not nearly as good for supplemental light in a greenhouse.  Some form of High intensity discharge light like Metal Halide or High pressure sodium might be better for penetrating into the canopy of multiple height plants while not blocking as much of the natural light as Florescent fixtures will.

Oh and yes, perhaps time for some more fish.

I have approx 120 tilapia fingerlings and 10 or so Gold Fish.  Its a 300 gal  tank.  How do I know how much fish to add?

Oh, in that case, DON'T add more fish.  Just feed them a higher protein feed.

I agree completely with TC.  No more fish...  but be sure to feed the ones that you have on a good feed and a few times a day - you want maximum poop production out of those little guys.  Why higher protein feed, TC?  Yes, HIDs would be mo' betta lights but if you don't want to go that route just add another fixture and position your plants so that they can be as close to the T5 fixture as possible.  And if you go with an HID make sure you get a daylight or full spectrum bulb because you have a variety of plants in this bed (both vegetative and fruiting).  And raise up that pH using a potassium compound will also help by also adding potassium into your system - potassium carbonate, bi-carbonate or hydroxide.

Thanks for the Ideas! 

Tiny tilapia have an extreme protein hunger and will grow well when fend high protein early on and a higher protein feed will usually provide more nitrogen as well and seeing as the nitrate levels are 0, I figured it would be good.

Of course simply switching to a high quality aquaculture feed instead of say goldfish flakes could have a huge impact as well.  I don't know what feed is being used so far.

After added PH up.  The PH is up today to 6.4. It's now showing in the green.  Do I need to go higher?  I am using a high protein gold fish food.  What kind of food do you recommend? Any other suggestions on getting my plants to produce blooms?

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