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i once saw one of mine releasing a milky looking substance into the water in spurts, i imagine it was eggs, and every now and them my cleaner shrimp plucks one off the glass to snack on
the main reason i asked where you got it is because maybe the origional owner had come across this before and can maybe tell you how he addressed the issue
i'm really hoping my fiancee comes through with the nightsea gear.... phyl was nice enough to share a link to it and it looks like the coolest thing ever..... omg i need it.... lol
while 71 is low, not sure that it is critical.... i know a drop in water temp can encourage ick, not sure if 71 is low enough to make you worry bout that though
also kinda looks like some sort of miniature anthelia.... or like the other poster said a xenia... looks troublesome to me, not sure how you would go about a full erradication, no telling how far it may have already spread...
be carefull which pipe dope you use, some are for gas and not ok for potable water.... make sure the can says it is ok for water, cause if it is ok for us, then it should be ok for our fish.. but extra tefflon tape should do the trick as mike said