Originally Posted by welsh
if they are in small tanks without a filter then you should be changing the water 100% daily or every other day.
absolutely no. Fish get stress out if u change them every day . Thet will get sick. Don't do it .
How small is u tank?
I have two jobs where i have bettas. One of the office i have fish in 0.5 gal. I change them every 7 days for approx 1.8 or 2 years
at home i have 5 bettas in the winter in 2.5 gal tank each . I change them approx every 10,14 days.
I always leave portion their original water,just as much as i can get without all dirt came from bottom.
I also started put aquarium salt for about 1 year ago , but i put less than instructions tell u. I read that it warking as preventative, but same people say it can influence kidney.
It is good put aquar.salt whan u treat fish