No you didnt fuck any thing up, in fact I used MG for my first grow and it came out perfect. BUT.... make sure you FLUSH THE SHIT OUT OF THE PLANT, or you will taste the nutes. Im talking pore 5 gallons of PH'd clean water per gallon of soil about 2 weeks before harvest time. Then use ONLY ph'd water with NO nutes in it for the last 2 weeks prior to harvesting. If you dont do this then yes, you will regret using the MG. laterz.. Also its not a very good fert, and the harvest will suffer for using it, but hey its a learning experience.
"Knowledge is Power"
"I am the very disease you pretend to be"