2 issues- Algae and Dying torch

[Reef Pilot]

Originally Posted by reefwars

i dont understand or my math is wrong but ....... ....how does removing 16% every three weeks better than removing the same amount rationed daily?

Because if you remove it every day, you are also removing that same proportion of what you just added yesterday, therefore diluting and reducing the amount of actual nutrient removal.

Think of it another way, and maybe might make more sense to you. If you exchange 10% of your water each day over 10 days, you will have changed 100% of your volume. But you still have some of your original water and nutrients present because of your daily mixing and dilution. However, if you change 100% of your water in 10 days, for sure you will have a complete exchange of nutrients and no old water.

I know this is an extreme example, but just using it to illustrate the point. It is actually math, and you can use any amount you want. Remember, that with each water change, you are also changing some of the water (and leaving that portion of nutrients present) that you exchanged the last time.