Black Mollies as clean up crew?

Well I was reading again and I think my initial source was garbage. Apparently a study showed that the ideal salinity for breeding is 25 ppt based on # of spawn released and fry growth rates. http://cmsadmin.atp.co.il/Content_siamb/editor/57_3_Vasagam.pdf

I keep mine around 35 ppt (1.025) obviously but I'm not here to raise 100s of mollies lol.

Some places say the lifespan is unknown and then this site

https://www.flmnh.ufl.edu/fish/discover/species-profiles/poecilia-latipinna/

says the males get sexually mature in less than a year and then die one year(ish) after maturity so I'm not exactly sure what the juvenile period is but I guess we can safely say 2 years max for males. I would be curious to have someone do a study on the lifespan of mollies at different salinities versus like you're saying a lifespan of mollies when they move between different salinities.
 
I just toss in the orange sailfin ones and they do fine for the most part, in the wild they can have big salinity swings sometimes and adapt well.
 
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