Regarding remineralization, I am using the little 3 gram scoop included in the package which gets the water around 5-6 dgh and 100 tds.
Tank is 70 degrees right now and I keep it around 74 in the summer.
The little pieces of orange substrate is flourite. Its hard to plant stuff in AS since its so light, so I put a layer of flourite at the bottom to help keep plants down.
Filtration consists of 3 Eheim Ecco canisters chained together along with a purigen reactor and a reactor containing nitrate removing resin, plus another canister that is totally seperate. I really don't think all those filters are necessary, but I wanted to try a low flowing filter setup that would have encourage the growth of anaerobic denitrifying bacteria.