As far as temp, they can withstand brief exposure to higher than 80-81F.
I think this is the limit for long term survival(79-80F).
For breeding, 78F or so seems better in terms of production or lower.
I had some lower grades exposed over several weeks at set temps and found the the lethal temp curves for my CRS's.
70-75F seems pretty good.
RCS are very tolerant by comparison.
As far as copper and other nutrients, they get this from their food, there's no need to add Iodine and copper to the water, you can if you want, but they need this like we do, as food, we do not soak in our nutrients via the skin

We get it from our food, shrimp may be able to do both, but if it's in the food, they have plenty
That seems pretty high in Copper just the same.
You can get those metal removal filters for th whole house or just for the tap and the aquarium.
Fairly cheap and activated carbon also might be wise as it will nab a fair amount of organics and offer good taste also.
Would not hurt and you will like the taste better. Also, change every 3 months for the carbon. No need for a RO filter.
Regards,
Tom Barr