I've been searching for a discussion about this, but no luck.
I am adding a sump/refugium with a dsb to my 75 gal. I have seen posts where people say the water change amount is calculated as a percent of the total water volume of the system (display tank plus sump/fuge), but I don't understand the logic to this. Assuming the bioload is the same, consider...
1. The fuge is removing some of the nitrates, so the water should get contaminated at a slower rate.
2. There is more water in the system, so the waste is diluted more.
I would think that at the MOST the water changes would continue at the same rate based on the volume of the display tank. More likely, I would think that the assistance of the dsb would reduce the amount of water change needed. What do people here think about this? How is water change volume and frequency calculated when adding a dsb fuge?
I am adding a sump/refugium with a dsb to my 75 gal. I have seen posts where people say the water change amount is calculated as a percent of the total water volume of the system (display tank plus sump/fuge), but I don't understand the logic to this. Assuming the bioload is the same, consider...
1. The fuge is removing some of the nitrates, so the water should get contaminated at a slower rate.
2. There is more water in the system, so the waste is diluted more.
I would think that at the MOST the water changes would continue at the same rate based on the volume of the display tank. More likely, I would think that the assistance of the dsb would reduce the amount of water change needed. What do people here think about this? How is water change volume and frequency calculated when adding a dsb fuge?