well would depend on the height of the tank, yours are only 18w t5's so not overly powerfull and you could easily get away with softies and lower light lps but sps prob wont do well unless near the top of your tank and nems require high lighting...they may live but they can do better.....to give an example in my last 20g i had a 250 metal halide (extreme mind you)and i was able to keep anything i wanted and had no colour issues at all, you would do better with 39w or 54w t5's or a 150w halide. its just my experience that lights that are border line strong give borderline results ,they may work for some stuff and may not for others depends on the coral.lights are only half the story though water parameters have to be spot on ,some corals can tolerate bad water while some slowly die off or die off right away again depends on the coral.
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