the seng siong at taman jurong is doin the same thing too.
the metal tank has a overflow, goes down to a sump with bio and artificial filter. and a skimmer too. but i think the skimmer is not good enough for the tank.
the bubbles not micro enough.
the seng siong food court just outside. the display tank of fishes/prawns/lobsters.
they have chillers there. i think the brands are from china. each tank about 4-5ft. with 1 skimmer only. and the bubbles cant make it.