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"They were kinda small."

Depending upon how small "kinda" is, then yes, I can completely see it a possibility that your guppies wiped out your shrimp overnight. Shrimp babies & juvenile shrimp actually make up a portion of guppies' food in their native habitats; hunting & killing small shrimp is "in their genes," so to speak.

A fully grown (1" or longer) RCS should...should...be able to survive in a guppy tank. Anything less than full-grown adults, all bets are off. Even if they do survive, they will likely do so by staying as hidden as possible for as much of the day as possible--not exactly a formula for maximizing the enjoyment of your shrimp, is it? [smilie=f:

This is why those of us who love dwarf shrimp emphasize again and again how much more enjoyable it is to keep shrimp in a shrimp-only tank. When there are no fish in the tank, shrimp are much more active--you will see them crawling around on every single surface in the tank (substrate, driftwood, plants at all heights of the aquarium), you'll see them freely swimming in the water column, all sorts of things. The amusement factor goes up exponentially. It doesn't even take a huge investment in tank size; a 10 gallon tank could easily support 250+ (adult & juvie) shrimp. On one of the shrimp forums I regularly visit, someone in there is successfully keeping over 75 alive & breeding in a 2.5 gallon tank (!!!) Now that's perhaps overkill but the point is, you don't need a "huge" amount of space to keep a thriving shrimp colony.

It costs almost nothing to set up a small 2.5 gal desktop shrimp tank. I buy the 2.5 gal tanks (including cover) from my local PetSmart for $11.99. You can buy a small pack of Estes Marine Sand (which, despite the name, is not only for marine tanks--it is merely a colored, inert sand) for $4 or so. (Note: sand is better than gravel for a shrimp tank, IMO, as it is easier to keep clean. And also, keep in mind red cherry shrimp display darker, more vibrant colors when in a tank with a dark substrate). A small sponge filter (like the Hydro Sponge Mini) would put you back no more than $7 or so, and honestly, if you put some relatively fast-growing live plants in your tank and were good about doing regular small water changes, you might not even need a filter at all. If the temp in the room stays at least 70º all day and night, you wouldn't even need a heater on the tank (though a small heater keeping the temp around 76º or so is preferable).

Another advantage of this setup is you could use such a tank to "start up" your RCS colony, and then after you're producing generations of babies you could take the largest of your adult shrimp and try putting them into your community fish tank.

Just a thought, at least.
 

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... if you choose to add more, pay a little more for sub to adults to improve their chances.
If he is ordering them by mail, that might not be an option. The reason shrimp breeders normally sell tiny ones is because they have a much higher survival rate in shipping than adults do. Most breeders I know who do a lot of shipping prefer to ship shrimp at 1/4" or 1/2" at the absolute max because you start seeing higher DOA rates once you get into shrimp larger than that. For some reason the adults just don't take the stress of shipping nearly as well as the juvies do.
 
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