02-12-2008, 01:32 PM
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I first must apologize for the length of time since this was posted. We normally try to answer posts much faster than this.
I have never used the SERA brand. But, I have used San Francisco Bay Brand. Both companies, I know, offer a "hatching mix" where you just add water and aeation and go. But, you must add areation. This may or may not have been conveyed buy your lfs.
They will begin hatching in 48-72 hours if the correct conditions are met. As to how long they will last, my guess is about 3 days. I have my "sun tea" jars set up to a 5 day cycle. I feed ALOT of brineys. I use about 3-4 sun tea jars a day. So, as you can see, my brineys never last very long and surely not three days.