I always have a few (7) pens inked up and ready to go. There is no official rotation, just pens I happen to have filled with ink for one reason or another. These are those pen and ink pairings.
Turquoise TWSBI ECO (Fine) filled with Diamine Aqua Lagoon for one year. Refilled once 8 months ago .
Ghost Franklin-Christoph Model 45 XLV (IF) filled with De Atramentis Adular Blue for 10 months.
Blue Opus 88 Koloro (Fine) filled with Diamine 150th Anniversary Golden Honey for 7 months.
Blue Opus 88 Picnic (Fine) filled with Diamine Aqua Blue for 5 months.
Beige Opus 88 Koloro (Fine) filled with Noodler's General of the Armies for 5 months.
Dixie #10 Methuselah's Pine Cone Noodler's Konrad Ebonite (IF) filled with Noodler's Proctor's Ledge for 4 months.
Blue Diplomat Aero (Extra Fine) filled with Pilot Iroshizuku Kon-peki for about 3 weeks.
7 inked up pens