Yeah I don't really think light will change anything with the growth of fry.Fry will be fine in ambient light.
Yeah I don't really think light will change anything with the growth of fry.
Maybe not in all fry but in some it will cause deformation.
Can you post a reference? I've never heard of light related deformation in fishes.
The only importance is that they have a day / night cycle.
Tbh I cant. I was told that and now that yall ask me I cant remember where lol I thought it was either here or my lfs. I was told without proper light guppy fry can get bent spines.
Gotcha. I hope it was the LFS. lol
I've kept many guppy strains as well as other live bearers in unlit tanks without issue. Enough light to grow java moss is a good thing though.
A black out is only 3 days which honestly isn't enough time to cause issues. The only problem I could foresee is some of the very tiny fry might not be able to go that long without food but fry are pretty tough little things. You either have to do the black out or use a UV sterilizer. The only type of filter that I know of that used to be used for algae blooms were diatomaceous earth filters. Common filters we use don't have the ability to remove ultra tiny particles like the free floating algae that causes algae blooms. There just aren't a lot of choices.
Personally I wouldn't use salt, just heat.