wow 16g almost sounds like tank OD , it's hard keeping levels right in something that small and yes never dose if your not testing
Anything under 50g shouldn't need dosing anyhow
I have a new 90g and don't dose it , everything was transferred over about 2 weeks ago from 2 smaller tanks that were never dosed
all I do is weekly 10g water changes , and tests everything seems to be thriving except my toadstool and finger leather but I just think they need time to settle
just wait till you run out of room very addicting hobby