Hi,u can go to pinnacle Aquatics at tampines.The reefer at crawford lane ,Ah beng at geylang,oceania at paya lebar,supreme 3 and supreme 5 and alot mre.Bascially u can search all of the Marine fish shop at FB.
Side hob is actually a gex tall tank for skimmer.I cut an opening using handheld electric drill. Then using acrylic sheet ,cut and glue to make a waterflow outlet .My tank is a 30cm IOS Cube tank.The compartment behind is small and got limited space.So i DiY an side tank for the skimmer to attached on.
Dun rush into stocking up livestocks or corals.Get the first stage correct.Cycled up the tank properly.Dose benificial bacteria to fasten the pace of cycling.Once the tank is fully cycled and the water parameters is stable.Then u can tink of wat fishes and corals u want to keep in yr pico tank..Aslo dun overstocked .