Sorry, you need to provide more info.
How are you seeing your difficulty is 0 on the rented rig? Are you looking at the pool? 0 is not good, it should be something.
What hash rate is the pool reporting? 350 khs is low, is that what you paid for? Does that match what betarigs is telling you?
For your gridseed, eventually it will become less and less productive as all the new ASICs with higher hash rates are hitting. At some point in a year, or less, your gridseed will be useless. You will spend more on electricity than you get in return. I suggest you sell it in 3 months and get some money back while you can.
It was showing up on the pool site
I'll keep it its my 1st mining rig maybe i can use to build a robot one day