04-26-2007, 12:32 AM
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Long answer, no you don't need one. They make maintenance much easier.
Better question, Do you want one? Yes.
Is your LFS making up stories? Yes. They are saying you have a product like a phosphate remover. Will it work for 6 months? Nope.
How they can compare a canister filter to a skimmer is beyond my comprehension. Think of this, a skimmer REMOVES waste forever, a canister TRAPS waste that later can break down and liquify polluting the tank if not cleaned bi-weekly. Don't trust that LFS.