I personally do 15% weekly. But more frequently is possible as well. If you have high or low anything that needs fixed, water changes are wonderful. Anthony Calfo says "The solution to pollution is dilution" and I agree with him.
Choise of ALK or nitrates? I don't understand. A water change could help lower both! What is your CA level? (And what brand test kits are you using)
Choise of ALK or nitrates? I don't understand. A water change could help lower both! What is your CA level? (And what brand test kits are you using)