01-19-2012, 03:59 PM
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use a screen or netting, but this will effect your lighting. glass will effect lighting too unless you keep it constantly clean of salt creep. the best bet would prob. be to build your own wooden box for a canopy to hang your lights in but keep the back side open to staple a screen on, that will allow for more then plenty gas exchange, as well as heat exchange for your lights ( unless they are halides which may need a fan in the canopy )
if you have a sump, the water draining to the sump will provide all the gas exchange you need. powerheads aimed slightly at the surface will also do this.
make sure to get a clown smaller then the one you have.