The fist should be fine.
I've used the pvc method and liked it because I could direct the sand where I wanted it to go.
They will be just fine. I would suggest using dry non-live sand. The "LS" you buy in bags is not as live as you may think...
Should i avoid buying the bags of LS? or do i buy 1/2 LS and 1/2 Dry CaribSea Aragonite Sand ?