03-20-2008, 05:01 PM
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For a properly stocked tank, yes, that is correct.
In your situation, though, there are going to be 2 choices. Changing all of the floss media at once, use tank water to completely rince out the filter and the sponge media.... or do the changes much more often. Instead of once/month you may have to do it twice/month, and still a good idea to use some tank water to rinse the canister and sponge media out then, too.
What test kits are you using? The color charts vary according to the manufacturer putting out the tests. With API its best to hold the vial up against a piece of plain white paper when checking color comparison... with Sera kits its better to look into the vial after setting it on a piece of white paper. Tests should always be read in a well lit room, also.
You listed pH as "upper pH"... the API kits will typically contain a low range pH and a high range pH. If you test high range and get a low reading, it's also a good idea to test low range too. The high range can only go down to a certain level, and if the pH is below that level there is no way to know where it is really at unless you test low end as well. The same applies in reverse. If you're testing softened water and the test comes out at the top of the end of results, you'll then have to test high range to get an accurate reading.
Test both pH with the kit and then compare the results. If it is within the range of both test kits then it will give you the same reading from both.
Also, that nitrate level is right on the edge of too much for safely medicating. You'll want to do daily water changes over the course of the next wk to bring it down. When testing the water, always make sure to do it before a water change, never after. Once the nitrate is down to at least 25 - 30 then I can suggest some meds for you.
Knowing the age of those parrotfish and the size they are and should be, I would also strongly suggest checking the pH in your tap or source water, to see if there is any difference, and if there is, how much. If there is more than .2 difference in pH, keep the water changes to no more than 10% each time to avoid shocking the fish.