That looks really good! I've never been able to keep one alive in an aquarium. Maybe I'll try one in one of the ponds. 
i have about 7 tanks in my house, and i specialize in heavily planted aquariums. the secret is getting the level of light the plants need, along with fertilizing the water column and sometimes adding co2 to the water column. in most aquariums, a regular light strip isn't going to cut it, as most plants need about 2 watts per gallon to grow well. So in effect, you need about 40 watts of light @ 6700k for a 20 gallon tank, and it grows exponentially from there. the normal strip light runs about 15 watts for a 20 gallon tank.
the cheap way i have solved this issue, instead of buying expensive power compact fixtures or Metal halide setups, is to use simple screw in daylight bulbs at walmart. they are cheap and i simple build a fixture out of some wood, an old bathroom fixture, and an extension cord, and BOOM, i have 100 watts of CF light from 5 bulbs, and light enough to grow any plant on earth...
of course, i digress... i wish i could over winter all my plants under those lights, so i wouldn't have to but water lettuce again...
