07-28-2013, 07:13 AM
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Yah, betta in a 20 is lots of room. They like floatimg plants so you might try some of those. If the kit came with all tetra stuff then the light will not likely be "plant freindly". Any lightning should be in the 5,000K to 7,000Kelvin range. Depending on your budget you can look at some low light LEDs (8watts would be a good start for low light plants) as they are cheaper long term but flouescents are still common.
Other fish, corys are a good second, a shoal of 6 - 8, whiptail catfish are cool, 2 - 4. These depend, somewhat, on your water parameters but pepper corys are fine in water that suits a betta, as are the whiptails.
Id suggest upgrading the food, New Life Spectrum make a good product, Omega also, less wheat and non-fish products in them and a good assortment of floating and sinking food.