05-06-2009, 02:46 PM
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cool, well i'd say give it a bit more time. Phosban is what I use also, and I believe that it does not leach back in even when it fills up. I replace the media once a month. Assuming you already had some of this slime algae before you added it in, it will take more than a week or two to really get rid of it. If it's cyano, just keep sucking it out the best you can with a turkey baster, or small siphon hose, or however, to remove most of the mass, and eventually with no nitrates or phosphates in the tank, it should die off and stay gone.
I have a 90 gallon also, and I do 25 gallon water changes every two weeks. I think 25% weekly would be a bit excessive, probably stressful on the livestock, but if you wanted to do weekly changes, 10% would be a better target.