Originally Posted by Sillyfishies
My moms been arguing with me about my fish and say "doing a water change will take out all the good bacteria". I just did a 2 gallon water change (best I could convince)
Show her this post or read it to her.
The good bacteria in an aquarium is mainly located in the substrate and the filter. There is a small percent living on decoration ,plants ( real or fake) , and in the water. Now if you go along and pull all your substrate out, you might have a small problem. Same if you replace the filter media. Taking out water during a water change is vital for the health of the tank. It keeps the water fresh and the bottom of the tank poo and other matter clear. Water changes on a fish tank have to be done weekly around 30-50% ( if you skip a week its fine, but don't skip two in a row, even if no fish or plants die they are still sitting in dirty poo filled, and toxic filled water)
Hope that helps ya!
Edit: don't ever truly trust chain store employees advice (research it first)most of them pull it out of there butts!