They do like their murkier used water which isn't too fresh on the eyes, But I stick to about a 25% water change every 2 weeks and mine is fine, Where as my piranha likes a good 40% water change every 2 weeks
Nice looking Channa Its amazing how many people don't know just how big they can get, I just got a 180 gal - 850 liter tank for my baby snake head,
Bit crazy but it will last a little until he's a bigger boy
"Sorry for the hijack"