Magnetic aquarium support (10, 100) comprising a first support element (20a, 120a) suitable for supporting an aquarium accessory and a second support element (20b, 120b), characterized in that each of said elements ( 20a, 20b, 120a, 120b) first and second comprises a magnet (26a, 26b, 126a, 126b) such that by coupling said support elements (20a, 20b, 120a, 120b), first and second, by means of the interposition of an aquarium wall (50) between them, the magnetic attraction force, which operates between said two magnets (26a, 26b, 126a, 126b) blocks said support elements (20a, 20b, 120a, 120b), first and second, against said wall (50), in which each of said support elements (20a, 20b, 120a, 120b), first and second, has a circular edge (28a, 28b) and comprises a lip (46a , 46b, 146a, 146) Outstanding peripheral made of flexible material, so that when said two elements (20a, 2 0b, 120a, 120b) of support are coupled to each other by interposing said wall (50), said lip (46a, 46b, 146a, 146b) protruding peripheral of said support element (20a, 20b, 120a, 120b) is flattened against said wall (50), thereby creating a suction effect that gradually and firmly blocks said support elements (20a, 20b, 120a, 120b), first and second, to said wall (50), wherein said protruding peripheral lip (46a, 46b) is placed on the outer circular edge (28a, 28b) of said first and second support member (20a, 20b) and extends beyond said outer circular edge of the respective support element (20a, 20b, 120a, 120b) and, therefore, it is possible to raise the protruding peripheral lips (46a, 46b) in order to eliminate the suction effect and finally separate the two elements (20a , 20b) of wall support (50), in each of the two support elements (120a, 120b) is p rovisto of a tongue (148a, 148b), to facilitate the disassembly of said elements (20a, 20b, 120a, 120b) first and second.Soporte (10, 100) magnético para acuarios que comprende un primer elemento (20a, 120a) de soporte adecuado para sostener u