Have some fertlizer here, wondering if it is safe...

I assume that you also have plants there. :)

If the tank is only 3-wk old, it still goes through cycling. Most likely, nitrates didn't even start forming there (but you may detect ammonia and nitrites). Phosphates didn't have a chance to accumulate.

I'd suggest you to concentrate on proper cycling for now. :) At the most, you may use root tablets to help your plants take off.
 
I wouldn't put that fertilizer in my planted tank simply because of the ammonia analysis. I'd be afraid of a major green water breakout. I'd use a fertilizer in which the analysis indicated that the nitrogen was from nitrates. And if it were a low light plant tank ( less than 2watts per gallon), I'd use an aquatic fertilizer without nitrate or phosphate. I also don't even put plants in the low light tanks until the cycling is already complete.
 
Heh, its my job to make sure the space on this board is optimized. Server space and bandwidth don't come free.

Lets assume your tank has indeed cycled (ammonia and nitrites are at zero). It will be much more effective (and cheaper) to dose nutrients on their own.

Dose about 1/4 teaspoon of KNO3 (potassium nitrate) per 20-30 gallons of water to raise your nitrate levels to about 5-10ppm. About 1/2 K2SO4 (potassium sulfate), to raise your potassium levels. Looks like you already have phosphate in your water, so you don't need to dose that. Your going to also need to dose trace elements. I use Seachem's Fluorish Trace. 3-4 capfuls every 2-3 days.

The dosing I've recommended comes under the assumption that you have a high light, co2 injected system. If you are going for a low/moderate light system, feed heavily and let your fish produce the fertillizer for your plants.

HTH
-Richer
 
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