You could cut way down on your feeding. Your fish may have become lazy and stopped grazing on your rock because of the abundance of supplied food.
I have 120g with around 10 fish, I feed 4 times a week one brine shrimp cube. 4 of my fish are over 4 yrs old.
I don't think you realize just how much stuff is on your rocks for them to feed on. You are supplying them with a eco system of algae and pods and various other things but still adding an abundance of food. If you cut down to a once a day feeding you'd be able to cut down the time between water changes. I preform a water change about 1 every 6 weeks if i remember. just my 2 cents
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