Planted Tank Guru
Join Date: Apr 2011
Location: Hamilton, Ontario, Canada
If you know what's going into your water, etc, not much reason to test either. I test nitrates now and again to see if they are creeping, but doing water changes on a regular schedule, TDS, etc, is usually always the same.
The only time I really tested before and after, was using my TDS pen to see how well flow was in my tank. Say your water is 200TDS in your tank and you are changing it with 150TDS water. You drain and then pour the water in and measure at different spots in the tank. If one side stays at 200-198-195-190 etc over a few hours and the side you dumped the lower TDS water in starts at 160-165-170 etc, you might not have enough flow. If after 5 mins, the whole tank is roughly within 2 or 3 TDS, the new water mixed well and you have good flow. My method anyways. lol.
Now, I just have a google calendar setup with all my days for feeding, ferts, water changes, excel, baby food, etc, that everyday I check my phone on what to do and do it and don't check much anymore.
20g platy, , 2 x 10g shrimp, 3 x 20g shrimp, 7.5g shrimp and 1 great dane/mastiff puppy.
Sump Pimp #2
My Tanks and my shrimps