Hey Sam do you understand the process that the tank will go through as it cycles?
The rock and aragonite will need to be clean when you put it into your tank
You got lucky in the fact it was a gradual degradation of their habitat, after your previous attempt it would be good to get all test kits and get an understanding of water chemistry
Add plants, a couple of fish and a bit of driftwood and wait for a week then check ph before adding anything else. Things will change as the tank cycles.