My mom gave me this for my plants. I'm wondering if I could use it for my VFT. 
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it would kill the plant too many nutrientsAquarium water works well.
No on the MircleGrow. It would quickly kill you VFT.
Your best bet is just to not fertilize at all; it usually does more harm than good. I seriously doubt this is your problem. How long have you had the plant? How much water do you give it? What type of media is it planted in? They grow in bogs with almost no free nutrition in the soil. That is why the evolved to be carnivorous. I grow a variety of carnivorous plants and they are not as difficult as some people act. You just have to mimic their natural environment fairly closely.
Do you feed it insects? if so, stop. The trap can only close a certain number of times.