Hmmm...I'm not sure if I remember right if you've already been advised to use crushed corals in the previous threads? You have an option for crushed oyster shells, limestones and marble chips placed in your filter to adjust the water chemistry. Those should help avoid the pH dropping too much. I did figure out some parts in Manila have soft water. Wondered why I had trouble getting the shampoo out of my hair when I lodged in one hotel there.lol A friend confirmed they also have soft water and she had issues as well with her pH fluctuating.
thanks Lupin
yup I now have crushed corals in my tank, all tanks are now stable
I had ph crash problems last year, now suspecting overdose of sodium thiosulfate could have contributed to my problem?
i just found a link which said 3 tablespoon of sodium thiosulfate is enough to drchlorinate 1000 gals of water, but lat year when my ph crashed, I was using about 3-5 tablespoons of sodium thiosulfate crystal for my 300 gal tank, so i'm curious now if it could have cintributed to my ph crash