Just looking at models, I think the BM220cs would do you better, it has a far more powerful pump and would skim your tank dry of goop.
The BM320Cs uses the aqua bee 5000 where as the 220cs uses the eheim. For this is pump I would always rate the eheim higher.
The BM320Cs is rarely sold also, most clients opting for the 220Cs
I will get you price on both though.
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