Originally Posted by smellsfishie
Yeah I understand all that.. I would think, though, smaller frequent water changes would be less stressful on the fish, rather than say a 100% change.
A few things....
First, just say that a water change in itself
(regardless of the %) is stressful. IF this is true, then the fish will be stressed with each water change..... therefore, smaller frequent water changes would create stress for him more often. But, larger, more infrequent water changes would create stress less often. Fewer occurrances of stress = less stress overall. Just a theory.
On the other hand, IF there is more stress with a larger water change... and less stress with a smaller water change....... what's worse? One big dose of stress less often, or several smaller hits of stress more often?
So, is it the amount of times
the fish is stressed, or the cumulative amount
of stress? I don't know really.... I'm just posing ideas for anyone reading to consider.
Now, what I think is that depending on tank size and if it's cycled or not..... In an uncycled tank, YOU are the one that has to remove the toxins by physically removing the water and replacing with fresh. So, if you only do partial changes you are ALWAYS leaving behind some of the toxins. Then, until another wc, more toxins accumulate and add to this part you've left behind the first time..... and so on.
In a healthy cycled tank, you do a water change to remove the nitrates so that they don't become excessive. So, you can get away with smaller or less frequent water changes.
So, regardless of if it's the amount of times a fish is stressed, or if it's the cumulative amount of stress, you still need to do 100% changes in an uncycled tank.
In a cycled tank, I would think you do what stresses your fish less... fewer larger % changes, or more smaller % changes.
For me & my fish, Í'd rather do a couple larger water changes as I think for him he's not too bothered by large changes... my 6.25 gal tank is cycled.
(sorry such a long post)