aquatic plants to use in a tank

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Look here:
http://www.bobstropicalplants.com/store/catalog/index.php?osCsid=921uiuaelcgqsca7q64rmms011

That will give you a good idea of what's out there, with guppies you are pretty safe, the biggest concern you will have for starters is how much light you have
i would guess you prob have stock lighting. most likely java moss crypts anubias and java ferns should work. with more info we can help you better.
 
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