Tannins in the mineral and bac powder have caused your water to brown, soon to follow by a bacteria bloom and die off.
Lets cycle the tank keeping tabs on ammonia for the first two weeks, as they convert to nitrite the bacteria will establish and convert that to nitrate. At the end of four weeks we can do a 50 percent water change. The following week the same, and stick some test shrimp in on week 5 or 6.
If tannins persisting you can put a bag of Purigen or activated charchol in to mop up any left overs for crystal clear water.