i grow my own, i add about a cup per day in a AGA 180, i have a couple feather dusters and other filter feeders that enjoy it, and my two Gonioporas seem to be growing faster.
once you get started it only takes me 10 minutes a week tops to start a new batch from the old one, best of all it's free.
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You can see some of my DIY stuff on my webpage,click on the little red house above.
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