Wow. Well, with salamanders I generally keep those that are undergoing metamorphosis in shallow unfiltered aquaria (they can touch the bottom with their feet and at the same time reach the surface with their heads). I also provide a slope so they can exit the water, either by placing one end of the container on something or putting a pile of gravel at one end.

Amikacin is being made - it's probably the particular brand name he's buying that might not be available any more.