calcium up up and away please.

[rickwaines]

I am having a hard time getting the Calcium levels up to where I would like them.
My tank is a couple months old. It is 40 gallons. I have five peppermint shrimp. Some snails and hermit crabs. Two pyjama cardinal and one small ish colony of palm tree polyp.

My kh is 9.5
ph is 8.3
calcium is 350 ish a little lower at times but not lower than 300.

I have been adding two little fishies two part ionic daily at recommended doses and have been done three 10% water changes in the last week. I had done none the 10 days prior as I was away but two part was being added by house sitter.

Any suggestions?

Thank you in advance. Rick