help identifying stuff

[Liam's tank]

Can anyone tell me what these three things are?
Thank you!

 

[ISpeakForTheSeas]

Not sure about the first two, but the third is a bivalve (most likely either a Thorny Oyster - Spondylus sp. - or a Jewelbox Clam - family Chamidae; I haven’t looked into the in a while, so I’m not sure which, but I’m leaning toward Jewelbox Clam; either way, it’s a harmless filter feeder).

 

[Mr_Knightley]

First is a Astrangia asteriaformes (florida star coral), second is a Cinachyrella alloclada, a very hardy type of sponge. @ISpeakForTheSeas is right on the third being a bivalve.

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[Liam's tank]

First is a Astrangia asteriaformes (florida star coral), second is a Cinachyrella alloclada, a very hardy type of sponge. @ISpeakForTheSeas is right on the third being a bivalve.

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Thank you guys SO much!

 

[Liam's tank]

Sorry to be a bother but I'm assuming that these are all good inhabitants for my tank. Also anything I should know about how to properly care for each one?

 

[ISpeakForTheSeas]

Sorry to be a bother but I'm assuming that these are all good inhabitants for my tank. Also anything I should know about how to properly care for each one?

No worries, questions are why we're here - yeah, they're all fine. I'll let someone else address the coral, but for the bivalve, you'll probably want to put it somewhere with moderate flow and offer it a good amount of phytoplankton. Phyto species such as Isochrysis galbana (T-Iso), Chaetoceros sp., and/or Thalassiosira sp. would be great to offer; a blend containing multiple of these species would be best.

For the sponge, most sponges feed on Dissolved Organic Matter (DOM) and Particulate Organic Matter (POM; most notably bacteria, but also some phytoplankton). Stirring the sandbed (if you have one) and or blowing off rocks and such can help put some appropriately sized food into the water column for the sponge to feed on.

 

[thamnasteroid]

First is a Astrangia asteriaformes (florida star coral), second is a Cinachyrella alloclada, a very hardy type of sponge. @ISpeakForTheSeas is right on the third being a bivalve.

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Astrangia astreiformis is not a valid name as it is synonymized with A. poculata