Hallo.
I have two Ap tanks and is always safer using more the amount of developer
suggested by the tank.
FOr Example: for 375mm i cook 400mm, for 590 I use 640, for 650 I use to do
700mm.
More, when you develop in a tank there is aways some liquid spillimg or
dropping, so this is safer.
Or sometimes you can make bubbles or some foaming and the extra liquid help you
in prevent incosistent result.
Just my 2 cents of Euro-


Ciao,
Stefano Bramato

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ed io imparo...