I have a 3 gallon and a 10 gallon that are cycled and healthy freshwater community tanks. I'm expanding, bc as seems to be the case usually fish keeping is addictive! I have a 20 gallon and a 50 gallon that I want to get ready and cycle. My question is if I save used cartridges from my 3 and 10 gallon filters, will that suffice to seed my new tanks with good bacteria and if so how do I store the cartridges and how do I use them in the new tanks? Thanks in advance for your suggestions!!