600ml ??!!?? Geez, that tank needs to be thrown in the nearest trash bin! Find a used Jobo CPE or CPA (< $300.00 for the CPE w/ lift). I use the single MF drum for it and it only takes 250ml. I've even run it with 200ml and never had a problem.
I use the 10L Kodak Flexicolor chems. In a "one-shot" mode. Cheap, simple, and lasts me for 3-6 months at a time.