Pouring hot metals into cool water

Ive been pouring 7 different metals into a 24 tall aquarium over the weekend, and the results have been super cool I poured metals with different melting points to see if they had any different effects when they came in contact with water. From Pewter (350f, 170c) all the way to Thermite (4000f, 2204c). Some of them exploded, some of them sank and made molten metal drippycastles, but they were all interesting. Here is a list of metals I used, and their melting points: Pewter 338446 F 170230 C Tin