how do you use it for brine shrimp?

You soak any food source such as brine shrimp in the formula. I don’t think live brine shrimp would work though.

Can this be used in freshwater aquariums?

The bottles I have say Marine Use Only...sorry.However, I do use on food I give my Angels and Madag. Rainbows...which is freshwater. No harm that I can see.

ASIN	B000255MGU
Best Sellers Rank	#23,726 in Health ( See Top 100 in Health ) #441 in All-Purpose Household Cleaners
Brand	American Marine
Customer Reviews	5.0 5.0 out of 5 stars (1)
Date First Available	25 February 2019
Item Weight	90.7 g
Model Number	SELCON
Product Dimensions	10.16 x 2.54 x 2.54 cm; 90.72 g

Selcon 60 mL

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