i had a pico type tank in the past were the only lights i had on it were LED's and low wattage ones at that. it was something i put together as an experiment by buying abunch of stuff at radio shack and trying to make my own little fixture.
i ended up using like 10 LED's i think they were only like .5 watts a piece or maybe they were 1 watt. but needless to say i had several small zoa colonies in there that thrived. so it is very possible that will work for you. just remember that different zoas/palys have different needs.
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