Don't worry so much about choosing the "right" product. Just pick one that you're comfortable with, buy a small container and use it. If it works for you then great, if not you're out $20.
Start with HC-GFO and go from there, it's a good product if you get it from a reputable retailer. Try reefsupplies.ca
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I have to go out and buy more snails for my hermit crabs.
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