bubble look a likes

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bm4pm

Aquarium Advice Apprentice
Joined
Jul 30, 2010
Messages
29
Location
plymouth,england
hi
i have just put some live rock into my tank and i keep getting what looks like a large bubbles floating around in the current in my tank. wene i fished one out i discorved that it had a hard shell:confused: . does enyone now what these are?and are they harmfull to my tank?
thanks
 
it could be a diatom looks a little like the bubble type thing in the top of the diatom picture.:(shame havent seen eny off the cool stuff floating around in the tank. i no what i should looking for now thanks.cant get a pic i need to get a camera thats good anogth
 
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