Newbie cider maker!

[Auldmanjacko]

I've just made up a yeast starter with 10g of cider yeast in a apples juice and honey mix. It is very volatile even after 30 mins in fridge. Have I made up too large a starter for a demijohn size?

 

[beerfactory]

what type of yeast did you use?
I used this calculator to determine I needed a starter and what size... but I am using an ale yeast. I would assume, if you know your starting OG, you could figure it out from this.
https://www.brewersfriend.com/yeast-pitch-rate-and-starter-calculator/
Here's some discussion:
https://www.homebrewtalk.com/threads/cider-pitching-rate.387094/