I went ahead and promoted your question to its own thread since this can generate a completely different discussion from where you originally asked this question (in Douglas' thread regarding his bacteria film issue).
My answer to you would be, stalling is the correct approach. In the meantime, read up on BioPellets as much as you can, which looks like what you're doing anyway. BioPellets can work, but BioPellets can also crash your tank. Every thank is different and will react/behave differently to BioPellets.
In short, BioPellets reduce nitrates (and a bit of phosphates). This is good if you have high nitrates, but can be pointless if you already have low nitrates (from other methods) and can be bad if you reduce nitrates too quickly and shock your tank. If you do start to use them, start small and slowly.
Many people are able to reduce nitrates in other ways. Eg, low fish load, less feeding, water changes, other carbon sources, etc. If one or more of the above applies to you then you're already implementing another method for which BioPelllets were designed for, probably.
Keep an eye on your nitrates. If they are already at a level that you're happy with, then the old saying applies to you, "it ain't broke, so don't fix it!"
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