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Hello, so I have a 21g tank, partially carpeted with hair grass and 4 anubias plants, a moss ball, a male betta and 3 platties with a mystery snail and some shrimp. My tap water is has too much copper to use safely so I give them bottled for changes however with quarantine and buying restrictions it's been harder to pick up enough water. I was wondering about how often they will need it changed since its lightly stocked. I unfortunately don't have a nitrate or nitrite test at this time, will order one in the future but was getting it tested at the store. Pre quarantine it was at 0 nitrites and 10 nitrate but may have changed, ammonia is checked 2x weekly and my apI test kit reads about .25 but it always looks that color even in new bottled water so it's hard to tell if it is that much or not. Previously I was doing 25% a week but would they be ok with changes ever 2-3 weeks until quarantine is over? How often do you usually do changes on lightly stocked tanks? The fish eat 2x a day and no food left over.