wrote:
You are right... lets say then a tbs every month...

You're gonna have to use less to stabilize to one tbsp/30 gallons.
You're removing about 56% of a tbsp in 2 water changes and putting a
whole tbsp back. :-| You'll have to do the math 'cause I'm too lazy -
I just add the correct amount of salt with each water change.

Anyway, it's better for your fish if you add at each water change so
they always live in the same salt concentration. It's like matching pH,
temps and everyting else. Remember, your sof****er fish have to adjust
a bit to live in salt and you don't want to stress them by changing it
more than necessary.

--
Elaine T __
http://eethomp.com/fish.html '__
rec.aquaria.* FAQ http://faq.thekrib.com