Gotta give my take on this...
The tank is indeed set-up by Harlequin... however, soon after they have setup the tank, due to budgeting from Suntec, they've decided to contract someone else to do the maintenance...
Hence, the person whom you spoke to... 1st day at job ( indication of new person taking over )... apparently, the new guys may not be up to the mark, and from what i understand from the people at Harlequin, the new guys only do change of water and also cleaning of the front panel glass....
Well.... there's only so much we can do about it... maybe send a petition to Suntec Managment?!
Just kidding!!