some kind of creature!

Question
There r these little creatures growing in the tank. They look like baby jellyfish. They grow on the rocks and on the glass. we r somewhat new to this tank...  

Answer


Hello,
from your description ( without a picture I can not be 100% sure) but it sounds like you have a  type of anemone called an Aiptasia.  They grow on live rock/glass and are transparent.  These guys can multiply  rapidly and sting desirable corals. If you can try to get rid of them from your tank by picking then off at it's base with tweezers.

Good luck Todd