[Lupin]

Hi Tango.:wave:

Liquid test kits are often better than test strips. How low is the pH? I may not be a marine enthusiast but I'll still be willing to help you.:thumbsup:

Crushed oysters will help increase KH thereby increasing the pH. This is a slow process but I find it safer than increasing it almost immediately which can sometimes prove harmful to the fish. Pls don't use chemicals like pH-plus. They can adjust pH temporarily but will never work well.

 

[Lupin]

Sigh..Another post to go with after talking to one of the members.:mrgreen:

Tango, your tank was beyond the overstocking level. As I had mentioned above, crushed corals and oysters will help raise the pH gradually and safely. Pls try to double check your nitrates using a different brand of test kit other than the Tetra Kits. Sera kits are one of the good options. If the nitrates reach above 40, do more water changes as this is the only route to eliminate excess nitrates.
The salinity level should be 1.023-1.025. 1.021 is opt to be a level suited mostly for freshwater and brackish water.

Good luck.:thumbsup: I cannot take the credit for this advice. Someone requested me to post this one.

Edit: Your test kits may not be accurate and your nitrates is probably high. High nitrates will result to crashing of pH and it may happen easily overnight or anytime soon.