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plants and light

I hate to say it, but you would be lucky even to grow water sprite with 
one 15 watt bulb.  
You did not specify if you have a 20 high or 20 long, but here are our 
recomendations for the amounts of light you would need.  Remember, these 
are just our recommendations, I'm sure there are people out there who 
have had good results with less, but in our opinion, you can never have 
too much light (reproducing the sun is almost impossible).

For a 20 high, if your growing 'high' light level plants, then we 
recommend 92 watts minimum.  For 'medium-bright' plants we recommend 
61 watts minimum, and for 'low to medium' light plants we recommend 
41 watts minimum.  

As you can see, you don't even have half the recommened light levels 
even for low light plants.  I would suggest you get some shop fixtures 
from a hardware store, in this fashion you could get four bulbs on the 
tank for a minimum of expense.  This would give you 80 watts of light, 
which should be fine for MOST plants.

I hope this helps.
Aquatic Plants Unlimited

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