On 15 Jul 2005 09:17:21 -0700, "dragon"
wrote:

My bettas are all in unfiltered 2.5 gallon tanks. How often would
ya'll recommend I do a 100% water change? I've been doing it once a
week in the past, but the fishkeeper at my LFS thought that was too
often. So, what does everyone think?

dragon

One thing to be said for frequent small changes, it is easier to use
tap water and not have to fiddle with the chemistry. What is in the
tap water is diluted. I do 20% twice a week and use water straight
from the tap. I would guess frequent (say daily) small changes (say
10%) would also keep the bacteria alive and not be in a constant "new
tank cycle."

I am guessing as I have larger tanks all of them filtered.

dick