Do you dose anything beside 2part between water changes? How long do you go between water changes? Do you even do water changes? What do you consider to be a healthy amount to change out?

I actually went a total of 22 days without one. Longest in my 5yrs of reefing. This last period between water changes my tank has never looked better. Only reason I forced myself into doing one was to replace consumed trace elements. I don't dose for them. I am wondering if I should, if I continue with this WC schedule.
I changed only 5g. Total volume of my system is around 47g.