You could try sending an e-mail to the manufacturer asking them what the difference, if any, might be. My experience is that some will respond immediately and some might take a week or more to answer your inquiry.
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Gene Heitman - 12 tanks (11 freshwater and 1 saltwater), 206 gallons, 20+ species of fish/shrimp/snails, 52+ species of plants ... 10 years ago I just wanted 1 tank with some fish
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