Planted Tank Obsessed
Join Date: May 2015
Location: Central Michigan
It would make a nice jungle tank but that sword will spread roots to cover the entire bottom of your substrate possible choking out the rest of the plants, if it doesn't choke itself. The rest of them will grow indefinitely unless you trim.
Honestly, I'd skip buying plants on Amazon. Instead, I'd look at the for sale section of this forum. Aquariumplantscentral.Com is another decent place to order plants, very well packaged and generous portions.
You can create a nice plant layout for a 7.5 with one or 2 stem plants and a ground cover of some kind. Not sure what you're going for but based on your post is assume low light/tech. Plants that come to mind are an easy rotala/ludwigia for background then some styrogen repens or downoi for a mid ground and maybe some micro sword for a foreground, possibly some monte carlo. Don't over think this dude.