Weclome to AA and congratulations on winning your battle.
Is setting up the tank, did you use RODOI water or tap?
I'm trying to understand where your nitrates are coming from. Please test your source water and post those numbers too.
Please do not add any addtiives that you don't test for. There is nothing using calcium (coraline slighty) so no need for kalk
or any other addtives yet.
Did you cycle this tank yet? Did you see a spike in ammonia followed by a fall and rise in nitrites, followed by a fall and a rise in nitrates?
If so then the tank is now cycled (2 weeks is rather fast) and you need to do a large PWC
. Consider adding another 50 pounds of rock (base is ok) to increase it to 1˝ pounds per gallons.
What is TLC?
Keep posting questions here.