i noticed in my tank the other day something growing which i hadnt noticed before and after doing a bit of noseying around the net im pretty sure they are barnacles.
it says they rarely survive in the aquarium and normally die of starvation due to them being filter feeders,
but these seem to be thriving they have covered one side of a piece of live rock and are now starting to grow up the glass on the back,
i cant get a pic as my camera is rubbish.
has anyone else got these in there tank or had them and if so have they had any problems with them taking over tank covering corals etc?

?