ok..i think i better give u the direction.

if you come over from muar town. then you will passby the muar hospital on yr right hand side. go straight all the way...then u will reach a traffic light. if you go straight after traffic light, u will goto Pagoh and exit the toll to SG.
then there is a middle road to some housing area. Take the road on your left. Go straight...(from the traffic light there you will see a 3-4 storey office on yr left. Imigration dept is over there)
Turn left after traffic light...go straight...all the way...you will passby some big big houses and factory. go further in...you will see a sign board said Brother Tan Aquarium on yr right. follow the sign board and turn to yr right will do. you will see a big big house/factory...