Where to eat in Long Beach -- near the Aquarium
About a mile or so from the aquarium is Siem Reap, a cambodian-chinese place. the waitstaff will tell you which dishes are typically Cambodian.
Siem Reap Restaurant, (562) 591-7414, 1810 E Anaheim St, Long Beach, CA.
See link below for Cambodian restaurants in general - these are owned by people who've listed, yes there's a church's fried chicken and some pho places. Use your judgment.