"FW" or "brackish" fish to marine tank?

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Autumnsky

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Happened to be reading and found this info on these fish being found in marine environments as well as FW and brackish.

Signifer Rainbow fish
Pseudomugil signifer – Pacific Blue-eye (Atherinosoma jamesonii, Atherina signata) — Seriously Fish

Others being Mollies and some say some Guppies.

One of the notations is for people who raise Seahorses and use Guppy babies as feeders.

Just curious if you have done this and why. Or feel free to join in on the wondering or discussion even if you haven't done it.
 
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