My tank isnt much larger than yours, it's a Superfish Home 110.
If you don't like the look of bubbles, then the easy solution is just to turn it on at night, then turn it off when you get up.
It may be the case that the sudden drop in pH was the biggest killer, esp affecting corals.
Depends where you are located as you don't have that info in your profile. If your in the US like most on this site, Gulf of Mexico for sure, just be careful as tourists can be targetted. I haven't been to Mexico myself as I travelled further South, but back in Uni a few mates did a summer together as scuba instructors there and said it was awesome (babe magnet supposidly but you can't believe all students say!)
If your in Europe, then its a relatively short flight to either the Amalfi Coast off Italy in the Adriatic Sea, or a little further flight time to the coast off Israel in the Med where there is the coral beach Eliat and the Yatush wreck. Portugal is v nice just watch the strong Atlantic currents.
Great barrier Reef off Cairns AU was amazing esp the giant clams. But I was very young and dumb back then doing lots of crazy things (Pirahna fishing in Brazil for example) so if I did it now i'd be thinking Great White Sharks...dur dum... dur dum...the Med is safer!
Scott