Freshwater fish in reef?

[drama07]

Just a curious question.

Are there any freshwater fish that can survive in a reef tank?

Thank you

 

[rick12]

mollies

 

[NYCBOB]

brackish water fish.

 

[serpentman]

A lot of folks acclimate mollies to SW to be used as feeders for predator fish. Scats and other brackish water fish can be switched as well.

 

[Palting]

20 years ago I started my fish-only 75 gal salt water tank with mollies. Acclimated 6 of them, and by the time cycling was done, I must have had close to fifty.

 

[Frogmanx82]

I've seen guppies make the switch as well.

 

[vwtanker]

mollies love saltwater, they also eat hair algae, but in my experience higher flow wears them out and they fade over time.

 

[scubasteve06]

Yeppers mollies will live fine in SW. So will GSP's (green spotted puffers)

 

[bdancing]

Our mollies also appear to love the saltwater. We started with 4, and their children are now having children. Ours seem to love playing in the flow from the pico pump, but I wouldn't call that high flow, and it's just a 20 gallon tank. I don't think they will be moving to the 125, because they are a PIA to net and get out of the tank with coral established.

 

[Rybren]

For a nano or pico tank, you can also use bumblebee gobies. I suppose that you could also use them in a larger tank, but the fish are so small that you'd never find them again.