If you plan to cycle the tank with the tetras, you will be keeping them for 4-6 weeks, since thats how long a cycle usually takes.
You could get other cories. I'd get some that won't get bigger than about 2 inches.
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*Kristin*
5 Planted tanks:
55g, 40g, 29g, 10g, 5.5g
10g N. multifasciatus tank, 5.5g Platy fry
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