thanks for the advise guys
it's going to be my first marine tank.
As i'm now working at the northern part of china xi'an, water quality here was low.
i bought a fluval edge 46L tank.
As much as possible, i would like to change water every 2 weeks.
There's also high chances of power failure here, thus i picked the air stone skimmer.
Next option..
the tank comes with aquaclear 20, do you guys think it's wise to swap the mechanical filter out with this Macro Aqua M-30 ?