Wow this is 2 mths late, anyhow i just drop by to provide some tips, as i recently started to rear saltwater fish.

I'm residing in Penang, so it is not too hard to find the saltwater supplies.

Here's the list of address you can check around.

North South East West Aquarium
H.Q:
25, Jln Melaka Raya 13,
Tmn Melaka Raya,
75000 Melaka.

1st Branch:
G-3, Block Anggerik 2,
Jln Berkat 15, Tmn Malim Jaya,
75200 Melaka.

2nd Branch:
5259-C, Jln Penghulu Abbas,
Bukit Baru, 75150 Melaka.

Since I'm not familiar with Malacca, you have to check the goggle earth or ask the local how to get to the road.

If possible post us some pics of how it looks like. Maybe some Penangites would like to go down someday.