Fish emulsion has a good amount of nitrogen so you might not want to use it the whole flowering cycle. I like to use cold processed hydrolyzed fish instead of emulsions. I use Neptunes Harvest, here is a little info they have on there website.
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Neptune's Harvest
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Emulsions
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[TD="width: 245"]- Uses several species of fish[/TD]
[TD="width: 245"]- 1 type of fish (trash fish)[/TD]
[TD="width: 245"]- No offensive odor[/TD]
[TD="width: 245"]- Stinks[/TD]
[TD="width: 245"]- Cold processed[/TD]
[TD="width: 245"]- Cooked[/TD]
[TD="width: 245"]- No oils removed[/TD]
[TD="width: 245"]- Oils removed[/TD]
[TD="width: 245"]- No meal removed (except Fillet)[/TD]
[TD="width: 245"]- Meal removed[/TD]
[TD="width: 245"]- No chlorine[/TD]
[TD="width: 245"]- Contains chlorine[/TD]
[TD="width: 245"]- Won't clog equipment[/TD]
[TD="width: 245"]- Clogs equipment[/TD]