Odor suggestions pls

2x2.5x7ft tent
170 cfm fan 4"
Phresh 4" (used maybe 8 months old total
1 girl
HIGH humidity 70%+
Smell 0 vented into same room

What is my best option?

1. Connect additional 4" carbon cone type filter to end of exhaust ducting
2. Have additional brand new phresh ready to replace old (same cost as above)
3. Add Ona to exhaust (weary of adding in same room)

Ona is bad for you and the plants if in the same environment is just replace your old one but if your exhausting warm air into the same room for a month or so you will start to get mold spawning