I want to rehome my cories and tetras from a 10 gallon to a 20 gallon long tank, which I think they'd be much happier in. I currently have an aquaclear 30 on my ten gallon and want to use the same one on my 20 gallon. But when I buy my 20 gallon tank, I'll need a filter to start the cycling process, right? I don't want to buy a whole other filter just for cycling the 20 gallon, because then I'll be left with an extra filter at the end and it will be a waste of money. But I can't take the filter from my 10 gallon because my fish still need it until the 20 gallon is cycled! Any suggestions?