yeah i have very hard water the pump is a 2200g powerhead!
water hardness has nothing to do with the current being produced. water hardness refers to the amount of dissolved minerals present in your water. this usually usually consists of high levels of metal ions, mainly calcium and magnesium in the form of carbonates.
to bad about that one fish though.
we really need some pics to help you out
i figured it was calcium build up along time ago i just thougt it would go away but when i first stared i ha clam water it still was there.