I disagree with the MC cheerleaders, Megacrop is a pain in the ass.
1. It is super dusty, that smell indicates that you're breathing it every time you open it.
2. It is inhomogeneous, which means you don't get a consistent balance of nutes if you're scooping out just a little bit, like the OP here with two plants.
3. It takes a lot of extra time and stirring to get the big chunks to dissolve.
4. The calcium is built in, so you can't make a stock solution and dose with a syringe.
5. I still had to add more magnesium so it wasn't really a "one part" for me.
For those reasons, I think the three part dry systems like Chem Gro, Jacks, and Master Blend are the way to go. MasterBlend is the cheapest with included shipping on Amazon, much less than MC2. You can make a stock solution of each part and dose with a syringe, which is very precise and accurate but much easier than using a scale. IME, a concentrated solution of MasterBlend dissolves faster and easier than making one fully diluted batch of MegaCrop!