Thanks GrimReaper. I've saved your calculator - very useful for a newbie.

On advice of lfs I am doing a 50% water change today to try and raise Ca &
Mg levels but will probably stop worrying too much if it is normal to have
lower readings initially.

Thanks Kim.

"GrimReaper" wrote in message
...
Hi Dave
A bit bored today so I created a single web page calculator to do these
sums. You can enter various SG's and tank volumes.
You can save it to your computer and use as and when


I have put it here

http://www.site266082.fsnet.co.uk/

The password to get in is "saltsums" without the quotes. Its good for ten
days

If you can't get in and want it just ask and I will e-mail it to you


Regards
Grimeaper