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unknown critter

  1. Pests, Hitchhikers, and Diseases
    Hey all have this filter feeder in my sand bed i have searched the net with no luck.it brings one arm in at a time filter feeding any help identifying this would be greatly appreciated.
  2. Pests, Hitchhikers, and Diseases
    ive bought a new rock to help with the growth of corraline algae in my tank.i noticed theres some red algae that looks like cyano.(this is my first time posting pics on here,so well see how it goes)and this...is the yellow sponge thats on it.i think the little white things to the upper left of...
  3. Pests, Hitchhikers, and Diseases
    This recently began growing on one of my live rocks. I like it; I'm simply curious as to what it is. Any thoughts?
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