Many will tell you not to use UGF
but in my opinion it's just as good as a plenum or DSB
BUT, in my case I prefer to use a pre-filtered, reverse flow undergravel filter.
I connected a Hagen 802 with a quick filter attachment to filter the water before the power head directed the flow through CPVC elbowed downward to the "uplift tube of the undergravel filter. This method sends clean water under the gravel and forces it's way upward into the main part of the tank.
Main advantage is it keeps the detritus in the upper layers and doesn't suck it down deep. I occasionally did a vacuuming of the substrate but fairly shallow and only 1/4 of the tank at a time.
This system went on for four years until I broke it down to try a plenum system. The plenum in my opinion was not any better.
My personal preference is the Berlin method which is just heavy protein skimming and lots of quality live rock. Most of my tanks are this way and are bare bottomed.
You don't want to use bubble wands as that will really cause "salt creep".
Power heads set to disturb the water surface will cause better interaction between the water and the air than any bubble wand can do. Properly placed, they will move the surface water and also the water thoughout the tank.
A 55g tank will not hold too many fish without overloading the biofilter. Also, fish like tangs, need a lot of room and are very territorial to boot.
If you put a tang in, it will have to be the last fish in and be prepared to trade it in for a smaller one as it grows larger.
Two clownfish will be ok if they are a pair. If not, it's best to go with one or three or more.