Quote Originally Posted by CatLABS View Post
Jobo reels are in compatible with paterson tanks.

The minimum chemistry needed for the Jobo 2520 is 270ml for 6 sheets, 640ml for 12 sheets in the 2550.

(all Jobo tank capacities are here: http://jobo-usa.com/images/manuals/t...capacities.pdf).

Developing by hand does not necessarily mean inversion, tanks can be rotated on any flat surface, or in place on the inexpensive Jobo roller base #1509 if one need to or wants to save space.
The 270ml you have quoted may well be enough to physically cover the film when using some form of rotation, but, depending on the developer and dilution, it may not be enough active developer to allow full development for 120 square inches of film.