Do I need to change water?

[fleek]

I am just wondering, if I have a working filtration system :

1) Skimmer

2) UV Sterlizer

3) Algae Scrubber

4) Canister filter

What is the benefit of changing water?

[Digiman]

I am just wondering, if I have a working filtration system :

1) Skimmer

2) UV Sterlizer

3) Algae Scrubber

4) Canister filter

What is the benefit of changing water?

The main objective of regular water change is to reduce nitrate and phosphate.

Skimmer, UV do not remove nitrate. Canister filter depends on what media u use, if not it is also useless in removing nitrate.

Algae scrubber is effective in removing nitrate and phosphate but may not be fast enough for bigger tanks.

However with a powerful skimmer and a algae scrubber in place, it reduces the need of water change but does not eliminate it totally.

Water change once in a while is beneficial as it replaces trace elements, reduce toxins (like heavy metals) accumulated and also helps to reduce nutrients level.