I have a similar issue:
1/ to keep pH at reasonable level (8.1 - 8.3, depending on time of day), I use Seachem Marine Buffer (blend of carbonates)
2/ as a result, my Alk is quite high, in the 11dKH / 4Meq area.
How can I keep a high pH while keeping Alk at a reasonable level? Is there a risk...