help pls recommend me any usefularo medicine and aquarium acessories

I will be back singapore mid august , so bro please recommd me any handy
useful medication and aquarium acessories . may i onlyable to visit 2 lfs during this trip . ie c328 and other havent decide
brunei here only got tetra,sera,azoo but very ex so pls introduce me some update accesories for aro ie nan light