Your mix should be just fine, it's actually a great one. You might want to look into getting a liquid fertilizer. Like Advanced nutrients,General Hydroponics or Fox Farm nutes. These all work great! The npk ratio in the dry nutes are a little on the high side. Advanced Nutrients works really well but, are a little spendy. If you want to save money go with Fox Farm or General Hydroponics 3 part Grow,Micro and bloom
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Hope this helps!