I always have a few (6) 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.
Kyanite Blue TWSBI Vac 700R (Extra fine) filled with Noodler's Ottoman Azure for about 9 months. Refilled once 3 months ago .
Green TWSBI Eco (Extra Fine) filled with Wearingeul Call of the Cthulhu for 8 months.
Sky Blue TWSBI Eco (Extra Fine) filled with Noodler's Texas Sidewinder for about 6 months.
Jade TWSBI Diamond 580ALR (Extra Fine) filled with Lamy Turmaline for 4 months.
Tibaldi Impero Celluloid Scriptorium Pens Idyll (Fine) filled with Pilot Iroshizuku Fuyu-syogun for 4 months. Refilled once 2 months ago .
Rainbow Asvine V200 (Extra Fine) filled with Rohrer & Klingner Magenta for 4 months.
6 inked up pens