Dose for the entire tank volume. Look into buying Seachem Safe - powdered form of Prime. Its more concentrated and last much longer. Ken's Fish sells it & I think Dr Foster & Smith too.
Prime smells like ass... So you know it's good.
I do 50% wc's, on my 55 I use a cap and on the 135 I use two. Never had a problem.
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Dose for the entire tank volume. Look into buying Seachem Safe - powdered form of Prime. Its more concentrated and last much longer. Ken's Fish sells it & I think Dr Foster & Smith too.
The smell of Sulfer or rotten eggs come from sodium thiosulphate that what you smell. It doesn't least long once it's added to the tank it goes away fast.