Hi htitcom,
We don’t have sharks in our aquarium now 🙂 they normally need loads of space to swim around, so we cannot have them in here! A lot of shark species need to stay swimming around to breathe and this is why we always see them swimming! But not all, some use mouth pumping to move water inside the mouth and help breathing even if they are still…In our aquariums we have sea slugs, anemones, hermit crabs, mussels, barnacles, copepods, algae, starfish, tubeworms….and whatever comes that we can keep!
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