Hi Pedro
I use the Acid method , mentioned in one of the threads.
To clean the gravel, and help to prevent PH spikes.
And with the deluted Acid solution, mentioned in yet another thread.
To help maintaine the PH.
I will Check over my notes, and let you know .
I lost my notes awhile back, and It took me awhile to look up all that information again.
Atleast we have a good reference guide, to look it up.

Just a little Good PR
The Tank Temperature is at 76
John