"Victor Martinez" wrote in message
...
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

100% changes should only be done on emergencies (i.e. you dropped your
cocktail in the tank).

Same size tanks, 80% water change weekly with a 100% change, and gravel/tank
clean every 2 months.
(works for me, and the Bettas reckon it's OK) :-)