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Freshwater mollies in reef/salt water tank

RR-MAN

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After watching a reef builder video I decided to add a couple of freshwater mollies to the tank. I was amazed how well they graze on algae. My tank is pretty new/clean but have some diatom on the rock and back wall.


Any of you guys keep mollies in salt water tank?

 

alex6528

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Did you just toss them is from full fresh to full salt, or how did you acclimate? I’m willing to try them.


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RR-MAN

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Took two hours to acclimate-some people do it for way less time.

They swim and act normal
 

ITreefer

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Interesting timing. I was just reading about these guys for algae control. Do they have problems with strong flow?
 

Alex77619

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I did too but seems like they don’t know what an anemone is and ends up all suicided


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paraletho

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I have a Black Molly that I put in the 300 on the recommendation of Humblefish on R2R. Ina system that is coming out of fallow or an established system with longterm fish that possibly have built immunities to ich or other diseases he uses them as canaries in the coal mine. They transition from FW to SW very well and have no resistance to SW diseases. .The solid black variety make it quick and easy to spot white spots or slime coat abnormalities..
 

PorpoiseHork

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The molly is one of the few fresh water aquarium fish that can be acclimated to salt water. If I remember correctly many live in fw streams that go open up into the sea and will oftentimes migrate to the brackish estuaries.

This article goes into detail about caring for fw molly's in a salt water tank.


Not a bad idea if you're looking to add some inexpensive and sometimes flashy livestock to your tank as many fancy molly's can have rather impressive coloring and large beta like fins.
 
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RR-MAN

RR-MAN

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Do they have problems with strong flow?
Good point. I have an MP60 and a high flow tunze and no issues.


My wife said get these two ugly fish out of the tank referring to mollies

I think they look cool.
 

alex6528

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So I have like 10-12 nems in a 60 gal cube. I’m guessing mollies would not be a good idea with all those nems?


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Tangs

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I did it years ago... I acclimatised over a few days. They lasted around a year I think. It was a bit sad watching the other fish eat their babies but that is nature.
 

Jbecwar

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I ended up loosing a bunch of fish to ich, did the fallow thing and added the black molly that was quarantined and had worms. Dropped right in to saltwater with no issues at all. Made it two nights and then the nem doubled in size and I never saw the molly again. It did really good feeding on algae. I'm surprised its not more popular for a tang replacement in nano tanks.
 
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RR-MAN

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I'm noticing one thing about my black mollies - mostly the stay close to surface. Only dive down when it comes to eating algae. Mine are doing very well so far.
 

oguzman

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So let me get this straight no ick resistance in the mollies? I think this would be cool but having an ick magnet kinda scares me.
 
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RR-MAN

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Quick update:

Found a bunch of molly fry in sump and display. Even the tangs were devouring the fry
 

steveb

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So let me get this straight no ick resistance in the mollies? I think this would be cool but having an ick magnet kinda scares me.
They aren't a magnet. They just have no natural resistance to saltwater parasites so will show symptoms when possibly saltwater fish have built an immunity.

The thing to keep in mind is once they are exposed to something in saltwater and assuming they are treated and survive, they are no longer good for the canary test.

 
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