Mold problems? Check your bulb syringe. When cleaning today I “backwashed” my bulb and got several flakes of mold/mildew in the water. Didn't document but 10 or so 5mm flakes. : r/fountainpens
Cole-Parmer Essentials Valved Pipette Aspirator/Bulb/Filler; 50 mL capacity from Cole-Parmer United Kingdom