I love local ecosystem inspired projects!
In college my roommate and I had a local fish only tank. We caught plenty of fish in our field ichthyology course. Instead of giving some a formalin bath, we gave them homes! Sea robins, star gazers, pipefish, seahorses, sargassum fish, toadfish. It was great fun.
I had a TA who's masters project involved the filtering capacity of oysters. He used cephalopod ink as the media being filtered (we also have a local cephalopod lab in the area that does neurological and behavioral research). My TA had no problems keeping our local galveston bay oysters alive. You might be surprised how easy they are to keep.
Good luck!
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