I have a 225 i WC 10-15% every week gravel vac every other WC as to not remove to much beneficial bacteria once a month 30-50% water change along with new bio and chemical filtration media keeps my fish happy and the tank lookin ohhh sooo sexy
20ish% every few days on all of them, with the grav-vac, always getting the easy to reach places and wipe off any obvious stuff on the glass. I also do a 30-50% change, glass cleaning and good vac job each week, on one of my days off.