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Threadfin rainbow fish?

Hello! I saw a bunch of these in a near by store, but the peeps working didn't know much about them. So I decided to doa a little reading up on them.
I read these little guys are very peaceful and vulnerable to fin nippers. So I was wondering if they would be ok with guppy. I think they would, since the guppy would be very peaceful, but would they leave the males fins alone?
I also read that in the wild they feed on crustaceans, so would they be a danger to shrimp? I have some very, very small cherry reds right now, abot a quarter of an inch.
Also, about how big do they tend to get? I know they are schooling fish and read that they'd do best with a few males and females. Would they prefer a ration like that of the guppies or do they not mind how many males and females there are?
Thanks in advance for the info!

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Threadfin rainbow fish?
Hello! I saw a bunch of these in a near by store, but the peeps working didn't know much about them. So I decided to doa a little reading up on them.
I read these little guys are very peaceful and vulnerable to fin nippers. So I was wondering if they would be ok with guppy. I think they...

Threadfin Rainbow Fish

The Threadfin Rainbowfish, aka Featherfin Rainbowfish are fantastic little fish that should do fine with your Guppies.
I would be more concerned for your Rainbowfish than I would be for your shrimp, as they would likely choke if they did try to eat a shrimp that large. I think though, that both would be safe.
These guys grow to be 1-1.5", so having a school of them is not a problem in any decent sized aquarium.
I would suggest a ratio of at least 3 females to every male. The females aren't nearly as impressive looking, so if you have the room, you may want at least 6 fish.
Here are some good profiles:
http://www.peteducation.com:80/article.c...
and
http://www.aquariumlife.net/profiles/fea...

Koodos for researching your choice of fish before bringing them home!

Edit:
I just noticed that in the first link I sent you it lists these fish as "aggressive". Please disregard this, it's a typo, as you will realize if you read the general description.