Yes Flourite need to be rinsed thoroughly, the product is completely viable and will still offer the same benefit, You can also use a water clarifier like Clarity to clump any small free floating particles together making it easier for your mechanical filter to catch. Your cartridges/floss will tend to clog from all the particles being trapped and will need rinsing or replacing regularly. And I agree with -Mak- about root feeders
I would use root tabs. But don't overdue them or your nitrates will sky rocket (speaking from experience, unfortunately). As far as rinsing, I like to put about half the bag in a bucket (only used for fish purposes of course) and tilt it to the side a bit while holding the head of a hose down into the bottom of the sand. This will flush all the particulates out of the bottom and let the water run out the top. Rotate the bucket around in the same manner until the water runs nearly clear. There are probably other/better ways out there but this has always worked for me. Good luck!
Rosette sword be alright but it needs Moderate to High lights, Vesuvius Sword could be little tricky lights Low to high no need co2 however it is a heavy root feeder, so will require a good quality plant substrate or root tabs.I was thinking Rosette sword and Vesuvius sword. I may have some val too, but I only plan on the first two at the moment.
What’s the difference between this substrate and regular sand if it doesn’t benefit the plants?
Yeah, root tabs will be needed then. Honestly Flourite is like sand or gravel that contains micronutrients. It doesn't contain some of the more important macronutrients, which plants need in greater amounts.