I do not think I would change any nore than 50% MAX........and if fish
are doing ok probably do a 25% and then do another 25% in a day or two
again. Too much too soon is as bad as not doing anything. Water change
is all that is feasible to get levels back down, and frequent smaller
changes are usually better than less but large changes.

IMHO for me to do a masive 75 to 100% water change my fish would have
to be in big troubles. Then again I keep aged water around so it would
not be as tramatic for them either........but large water changes can
be bad.


On 14 Jan 2007 11:12:50 -0800, "JB" wrote:


Tristan wrote:
The rotten egg smell is more than likely hydrogen sulphide which is a
build up of decaying matter in the gravel. It smells like rotten eggs.
Do you give your gravel a routine vac cleaning?

Amquel Plus other than doing what Amquel does also locks up those
nitrates and nitrites, and makes them safe, but they will still show
them as present on a test. A water change wil dilute that reading, and
after 2 or three changes with proper feeding routine and vac of gravel
they all should be within limits.



I did a 100% Water change just over a week ago, and when I did, I
rinsed off my gravel thoroughly, and all my plants, and cleaned out my
filter housing & changed my filter, plus removed a ton of algae from my
tank just over a week ago...

I added Cycle to my tank to get the beneficial bacteria going, and am
due for more soon.. So should I do as the previous poster suggested
and change 75% of my water even though I just changed and cleaned
everything just over a week ago??



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I forgot more about ponds and koi than I'll ever know!