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A MONTH? ...Maybe you misunderstood the fish-store guy.
You haven't said anything about plants. Let the aquarium run for a couple of weeks with plants before you start putting the fish in.
Plants help create a biological environment that keeps the tank healthy.
For a standard five-gallon tank you can probably get an
all-in-one topper. Everything but the heater-- you have to get that separately. But in some climates the light alone will keep a small tank warm enough. (Not here. My saltwater tank is directly in front of a window because they need the extra light.)
they are combative and will kill most other fish
If I approach his tank all of my fish surge to the top with anticipation of being fed.
What kind of food are you feeding it?
Bettas generally do fine in large community tanks, it's just other bettas they can't stand.
I was told at the aquarium that what sets off the bettas are the colorful fish.
[edited by: Planet13 at 4:50 pm (utc) on Aug 5, 2011]
So you could cut ( or dice and slice ) your losses ..and get a rat..