01-18-2014, 12:54 AM
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I'll spare you the tank size lecture, we all did stuff like that when we were new. I doubt you can do this now, but in the future if you want to divide a tank just put an underground gravel filter plate in the bottom and push the divider in place before adding substrate.
As for your set up, I'm a little confused why you are seperating the livebearers from th betta in the first place. In a planted tank you should have no problems. If the tank is divided and the betta establishes territory, look out as it will be No Trespassing.
If I were you, I'd watch Petco for the $1 a gallon sale. Get a 20L and move the livebearers.