We have always said that it will appear in your tank before you know it then you will spend more time trying to keep it from growing on the things you don't want it on! Not really a need to "buy" it.
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That is an important distinction. I've ordered other things from Algae Barn, twice, and found them to be useless. This product, however, is not. I got mine from Saltwater Aquarium, fwiw.Has always worked for me. This is not made by Algae Barn, they are just resellers. I believe this stuff does have a shelf life and should not be allowed to get too hot or too cold or it can kill the spores.
As others have said, you can always get some scrapings from other reefers and accomplish the same thing.
i went direct to the "manufacturer site" (ARC) to purchase it---free shipping--order by a certain time and it ships same day.Has always worked for me. This is not made by Algae Barn, they are just resellers. I believe this stuff does have a shelf life and should not be allowed to get too hot or too cold or it can kill the spores.
As others have said, you can always get some scrapings from other reefers and accomplish the same thing.