I got those, only one out of 6 grew.. the onion plant. The other bulbs molded and never sprouted.
I read up a little after the fact about them, and it was reccomended to put them alone in their own container with some dirty gravel from the tank and water and leave them be til they sprout, *if* they sprout. Also, if you get any floaters, they are duds most likely, but one person said if you pinch the bulb til it sinks sometimes they'll sprout.
Once they come to life, you're good to go, just stick the bulb 3/4 of the way into the substrate.
I wouldn't reccomend putting them into the tank from the start, as the duds can get pretty nasty.
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