Maximum Percent Water Change Out?

[sen5241b]

I'm sticking with 20 to 25% changes.

[lightcs4]

I do 10% weekly, but would be willing to do 25% if it was urgent, 50% max and then only if I was desperate.

[cthegame]

Lucky i never had to do anything more than 25%. But i would do up to 50%-75% if it got out of control. Of course at that point, my livestock would be in a QT.

[Piggy]

The most I did was a 60 gallon one. But only because I treated for flatworms and I had hundreds if not thousands of them. But usually I do 10%.

[shadowsfox]

I'm voting 20% cause it works for me.