I only use a TDS
meter to make sure my ro
is working and the filters do not need to be changed.
I would never use a TDS
meter to determine if a tank needs a PWC
because it will show a high reading just from the food/supplements you add.
For the first 6 months I recommend performing a 10%-15% PWC
weekly until your tank stabilizes. After that you can cut it to 10%-15% every other week as long as you donâ€™t overstock/overfeed your tank and your no3
remains below 10 ppm
is necessary not only to keep your levels balanced but also to replace trace elements your fish/inverts need.