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In the summer I do bi-weekly 50% WC, not because the tank need it (it doesn't, at all), but because it's still better than tap water for my plants and the water barrel is empty at this time of year. I figure it's gonna have SOME fish poo in it .... plants look amazing, tank looks amazing.
In winter, I don't bother as often and only the house plants and garden pots get the good stuff ... :p Waste not, want not!
55g planted: 10x adult guppies, 9x kuhli loaches, 7x black neons, 2x neons, 6x Amano shrimp, assassin snails & cherry shrimp
10g planted: Occasional platies & black devil trumpet snail