I have done 50% straight from the tap for the couple years I've been keeping tanks regardless of the bio load. Only time I changed this was my shrimp tank since it had zero bio load and the shrimp don't care for changes in water parameters. If I skip a week, it doesn't really make or break my tank. I have always kept low tech tanks, lots of plants mass, lots of bio load. A consistent schedule has always kept me in line. Saturday morning I get up, put the hose in the tank, start the siphon, brew coffee, get my daughter up, potty time, change her clothes, hook the hose up to the faucet, adjust temp to 76*F, put hose in tank, treat with prime, drink coffee, enjoy a couple YouTube videos while the tank fills, done. My tank is in the dining room now, it was in the living room before, so it has always been in the central part of my home. It makes water changes very easy since I can do lots of things while it basically does the rest. I also have about 50-75g to change every weekend on my tank, so it does take a hot minute.
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