I just checked my salinity tonight and it is at 30. I have been busy and have not checked it in a while.
I am mixing water now to do a 20 gallon change and bring it back to 35. I am hoping that is the problem.
Ok, thanks. Clam has only been in the tank for 2 weeks so, Not really an indicator of water quality I guess.Without knowing your Alkalinity values before the water change I can't know for sure if that was the problem. I'm going to guess it is. If so this will also affect the Clam but clams usually look great until they are almost gone. Are there fresh growth rings on the clam?
The supplement is a good idea as it will allow you to maintain a more steady Alkalinity level. Meanwhile, add a couple teaspoons of baking soda to each gallon of you topoff water until you start using the supplement.