you can always use some baking soda for small adjustment only. or can make soda ash with baking soda by baking the baking soda at 400°F for 1 hour let it cool and mix 1 1/2 to 1 gallon of RO water and you have alkalinity mix for dosing. same as you would get from BRS...
I have a large colony of Duncan about 6 years old asking $350
small polyp Green Hammer 25 heads $100
small polyp Green Hammer 19 heads $80 Pending
or all above for $500
GSP 4" X 4" tile $45
Fireworks cloves large frags $40
Green Kenya Tree Coral LG $40 $25 SM
Toadstool leather coral green polyp...