Planted Tank Guru
Join Date: Nov 2009
Location: Missouri united states
I signed on for water changes when I began keeping fishes four decades ago ,and have had good result's with regular water changes.
Walstad tank's I have seen were small and very few fishes.
Could perhap's get away with monthly water changes in these type tanks with lot's of plant's.
Have yet to see water changes hurt fishes/plant's unless...they are few and far between.
If the twenty minutes it takes to change out a portion of water in my tanks became an issue,I would quit the hobby.