Mixing nutes together, as opposed to combining them in your solution, is a bad idea. (In other words, add the nutes one at a time to your water - don't mix all the nutes together and then add to the water.) You can mix different nutes, or different brands of the same nutes, but why would you want to? Like Bongojaz said, decide on a brand of nutes and go with them.

There's lots of good info about nutes on this forum, you just need to do a little research. It can be a little confusing at first, but keep in mind that you need your basic NPK nutrients and then you might want to add some supplements to that. A typical regimen might be Grow - Micro - Bloom (basic nutes) plus CalMag+ and Liquid Karma.

If all of that is too confusing, or too expensive, you could go with CNS17 which is a complete one-part nute (no need for supplements) that only costs $25/gallon.

PC :smokin: