One time use, you should be fine. Repeated doses because "everyone always says use ca-lmag" is not the way to go. Calcium deficiencies usually show up as rust spots and then progresses towards leaf necrosis. If you see this, then reach for the cal-mag but go sparingly during veg because calcium needs are not very high at that stage of development.
In your case, I believe the less than desirable start is due to leaving the humidity dome on after the seedling breaks the surface. The yellowing can be caused by overly humid conditions as your seedling struggles to transpire. Since it can't transpire properly, it can't move nutrients very well either. You corrected it though. You should be fine going forward. Most soil mixes have enough nutrients to get you started for the first couple of weeks. You shouldn't need much more than plain water. Then gradually add your nutes.
I am at a disadvantage having never used your nutrients so I'm not familiar with how they work together. I've tried a lot of different brands of nutrients. For me, General Hydroponics "Flora" series has given me the greatest amount of success. It's inexpensive and easy to use. With that said, most brands work so stick with what works best for you and what you're most familiar with.