In a 3 gallon, you could keep it alive with a lower tech setup, but might take forever to carpet. My suggestion would be buy enough to carpet from the beginning, since it's so small.

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I agree with the previous post. I've grown montecarlo in a low tech setup; the carpet just takes a long time. Depending on your hardscape and what other plants you plan to have, 1-2 tissue culture cups should be enough to cover quite a bit. I used 1 cup for my five gallon, but I have a lot of patience and rocks in there. A plant that has a similar look, but is a bit taller and can be shaped into a pseudo carpet is hydrocotyle Japan. It may be worth checking it out. I've grown this successfully in a low tech setup.

 

Thanks for the advice! I think I will buy enough to cover the bottom since it is pretty small.

 

It grows at a decent rate. I have a 2.5 gallon with excel, no co2 and growing monte carlo pretty good. It carpeted fairly quickly for me. Starting with more will always get you there quicker though.

 

What kind of light is that? Cool tank

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Thanks, it's a Finnex Stingray Clip on LED.