Green Torch help

Bought a 2 headed green torch a month or so back - nothing has changed water quality wise rest of the tank is thriving - with the exception of one of the green torch heads.

Upon closer inspection I noticed what looked like a "sweeping hand" that retracts and my guess would be; annoys the heck out of part of the torch which keeps it from reaching its intended potential.

See pic attached might help with how to get rid of it or what is it?

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and here is a pic of the "sweeping hand" as you can see this side of the torch looks nothing like the other.

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Oh, thats a barnacle....guess you could be careful and close the tube with a dab of superglue gel. [smilie=smile.gif]

Cheers,
 
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