Hi laura!
thank you for replying

my ramshon snails have white marks on the shell, which I read, means the water to too acidic and eating it away, so i have raised my ph level and put the corner filter in there with the shell grit and eggshells. I cant get liquid calclium at my local pet store

I might get my husband to drive me to another one today to have a look. I would rather use liquid calcium becuase the corner filter is taking up too much room