Hosting sites on same hosting account

I have a few sites, two of which are authority brand name type sites with quality content and white hat seo only. I also have a few sites which I'm testing black hat tactics on. The sites do not link together however they are all on the same godaddy hosting account.

Will the blackhat tactics for some of my sites hurt rankings on my authority accounts? If so how do I separate them out? Is simply adding one more hosting account enough? Other options?

thanks in advance for the help.

Yes, I think you must don't use the same hosting account for bh et authority site. you can contact godaddy and open an another hosting for your bh project or add a single IP to your authority site (cost 2-3$ per month usualy)

Just shift your BH sites on different host. Using authority site on same hosting is not good thing.

Preferably order and add a dedicated up to the authority site
it is much better