my alk is just under 7dkh, my ph is 8.2, my calcium is around 400, if i want to raise the alk to say 7.5 how exactly do i do this, ok i know i have to dose, can you confirm its bicarbonate of soda, or baking soda, and its dripped overnight, ive never needed to dose before but now its slightly dipping, i have alot of corraline now and my rocks are covered as are my phs etc, can you please just descibe basically what i have to do, i have read articles and got a good idea however i need to just have a couple of replies or 1 reply whatever just giving me the basics so i can put 2 and 2 together, many thanks, by the way i know you will say water changes because its a small rise, however i would like to know for future reference and usuage