Taz man, welcome to RCU.

No, DON'T TOSS IT. Check to see what your manual recommends as the CG location, then test it and see where it balances. Great Planes makes a nice CG machine, but can't eleborate more about it as I don't own one. I usually just use my fingers and to date I haven't been off too much. Rule of thumb the way I learned it is, a tiny bit nose heavy is generally ok, it you can't get it right on. A tail heavy plane will fly only once. I'm not familiar with your plane. Forgive me, but is that glow or electric?

If it doesn't balance where it needs to you will need to shift around servos, battery or anything else that can be moved.

Again, welcome to the best hobby.