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Found 2 species
Mummichog
Fundulus heteroclitus
Tough little estuary killifish that handles swings in salinity and temperature like a champ, so it is great for a low-fuss brackish setup. In a group they are busy and curious, and breeding is fun to watch when males flash gold-green spangles. They eat pretty much anything that hits the water.
X-ray tetra
Pristella maxillaris
This is that little see-through tetra where you can kinda make out the spine inside the body, and then it tops it off with those sharp black/yellow/white fin markings and a reddish tail. Super chill schooling fish, and it's one of those rare tetras that doesn't freak out if your water isn't "perfect Amazon blackwater" 24/7.