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I saw a beautiful Betta today right before the pet store closed, so it might sill be there tomorrow. I have a 5 gallon, but it is already inhabited by a male. I have an empty 10g tank that has been running for a while now. I was going to put a crayfish in there, but I guess that can wait (it is more expensive). Is this too big of a tank for only 1 Betta?

I was also thinking that I could keep him in there until I could get another 5g so I can still get a crayfish. Is this a good idea?

Also, the 10g currently has greenwater which I was hoping to resolve with Java Fern. Is it safe to put the Betta in this? I know it's algae, but would it effect the fish?

Again, this would be a temporary tank until I can get my hands on a 5 gallon.

Thank you!
 

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In my experience a 10 gallon is not large enough for a crayfish. They have a tendency of escaping. Once I moved to larger tanks (20-29) I never had another one escape.

Green water is not going to harm the fish.
 
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I have 2 of my bettas in 10g tanks, and they love them. It's not too big.
 
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