+1 to the post above.
Never tried star fish but they also need a established aquarium. As far as clams go, I've killed two in a 34 gallon tank probably because the tank was to new.
Clams need very specific parameters, really good water, and have specific food requirements along with good lightning and a very expensive cost. If you decide to get one, I strongly suggest getting a 4”+ as they have the most chance of surviving. Also check about the supplements needed to successfully keep any form of clams.
My suggestion is to start small and slow to see how your tank takes it and read lots and lots when adding new livestock. Tank crashes are not fun and tend to be very costly.
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Casual reefer
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