11-13-2006, 06:26 PM
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I have seen that they work but only if you are feeding the tank with waste and ammonia. This is easy enough for the one sI know because most do a fishless cycle and it is never a worry. I do know that I have found the product has to be refrigerated and has a shelf life of less than 6 months according to the manufacturers I have gotten to respond.
I personally think that seeded sponges, filter media, gravel or ornaments are still the best way to do it because they have all the bacterial strains that are needed to start a complete cycle and not have to worry about the "stages" taking so long.