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We took some snails & crabs after a friend had to take his down. All his crabs and snail have hard spikes growing on them, apparently he had quite a bit of these spikes on his rock & power heads too. They are really hard and possibly hollow. Dont seem to grow very big. Havent noticed anything...

Just in the processes of switching over our reef tank from a 50 gal to a beautiful 175 gal. Bought the 175g second hand and got a few extras with it, like a UV sterilizer. Never used one before and wondering what the pros/cons are if used on a reef system.

Anyone know the name of this algae upfront in the pic?

Anyone know what this is? These hair like tentacles/arms stretch out across my sand periodically. It collects debris so i havent worried about it too much. And don't seem to cause harm to corals. They are smooth like hair, not brittle star like. It moves around too, but have never seen it do...

Hi! I just got these black clown fish that have yellow mouths/fins. It is hard to tell by the pictures but the yellow is really bright (like yellow tang bright!) The lfs just called them black clowns. Has anyone seen clowns like this? Curious if they are a specific species. Or if they are...

We bought a blue sponge about a month ago and recently this red cone has popped up on the same rock. Its a bright red, brighter near the top than the bottom. It slightly expands and contracts periodically... Maybe filter feeding. Has an opening at the top (mouth?) Any ideas on what it is?

I found this crab in my tank. Wondering what type it is and if it's reef safe? We've had some corals mysteriously dying off lately (we have good water conditions) and wondering if this guy could be the issue. We transferred him to a different tank for now until we find out more about him.