Hi Sam
Fuji 90mm is not a macro lens. so will suggest you get a raynox or a fuji extension tube MCEX-11 or MCEX-16 for close up macro on your subject.
Im using a Fuji X-T1 with 60mm macro (2:1)mounted with a Extension tube MCEX 16. Using Nissin I40 flash and DIY Diffuser. I dont shoot auto...