Magnetic support (10) for aquariums comprising a first and a second support element (20a,20b), each of them having a magnet (26a,26b) so that by coupling said first and second support elements (20a,20b) by interposing an aquarium wall (50) between them, the attracting magnetic force operating between said two magnets (26a,26b) locks said two support elements (20a,20b). Each support element (20a,20b) comprises a flat element (40a,40b) made up of flexible material having a peripheral projecting lip (46a,46b), so that when said two support elements (20a,20b) are coupled together by interposing said wall (50), said peripheral projecting lips (46a,46b) are flattened against said wall (50), thus creating a suction effect.
