I have not tried variations to get the food to float, so I can't answer that. The recipe as written will not produce a floating food.
Garlic guard contains garlic extract and vitamin c , along with preservatives and what not. It's the best part of garlic ( the stuff in garlic that is supposed to be what makes it healthy). I don' t know if it makes shrimp more attracted to it, but it sure makes fish notice the food.
As far as the shrimp go, my very first "mystery" snail didn't lay eggs for the first two months I had it. All of a sudden it laid a huge clutch- it being the only snail I had at the time it was perplexing. Unless you've had that single snail a very long time or are sure it is male, I'd say anything is possible.
At petshrimp, they say "the fish" can't take iodine out of the water column.. are they referring to fish or inverts, or just aquaria in general? I would be very interested in seeing that info if you have a link. Personally, I have never seen definitive scientific proof that freshwater shrimp even require iodine supplements, so I'd be very interested in their research.
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