Bderick6720% daily would be far better then 50% twice a week. Not only are you changing a larger total volume of water 140% vs. 100% but you are removing the nitrates sooner so they do not accumulate.
sodenoshirayuki;2807952; said:It might be a waste, but better to do more, than to do less and have the aro die. 20% daily is perfect. Not too much not too less.
I agree, less more often will provide a more stable enviroment.