Not worth the risk to me... I like to watch the tank and my mother had cataract surgery, so don't to experience that... so a "couple of bucks" to spend on UV coated glass isn't too bad. It's probably very low risk as noted, HQIs don't generate a lot of UV, but eye damage is cummulative...
http://www.newton.dep.anl.gov/askasc.../chem00539.htm