09-04-2009, 11:44 AM
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The fact that it is fine in one tank and not in another suggests there is someting different between the two tanks, so the question is, what is it? You haven't provided any info on light, water parameters, fish in the 10g, and whether or not you fertilize and if so with what, so I can't say much more at present.
But one thing does stand out: JM attaches itself to objects like wood or rocks. While I have had it "survive" floating, I have not experiemented with how long this will work, and certainly all my JM that is thriving is attached to wood. I have minimal current in my aquaria, and relatively low light. Beyond suggesting that you attach some to a piece of wood or a rock and see if it improves in the 10g, we'll have to wait until you post the afore-mentioned information.