Question about grounding fuse block

So Im in the process of installing my ibs dual battery system. I have a blue seas fuse block under my hood that I am going to have wired to my aux battery. My question is will it be ok to just run the ground from the fuse block to my main battery? This has been a huge learning curve and just dont want to burn my truck down or mess anything up. Thanks ahead of time.

 

Anybody?

 

A good rule of thumb: Ground is ground, world round.

 

Cool thats what i thought but i didnt want to blow up a battery or anything

 

Just curious why you want to??

If you look at any of your factory fuse blocks there are no grounds even close.

Now if your planning to use this new block as a distribution for your ground wires that would be the only reason a groud needs to be attached