Zoa's not opening all the way

Joined
Nov 14, 2011
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Canyon Country
#1
Recently my zoa's arnt opening up all the way, it's only this one kind of zoa's that are having this issue. Everything else in my tank is doing fine, there isn't anything around to sting or bother it that I see. It's been in this location for a year with no issues. Any ideas of what could be causing this?
 
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