Galaxy of starfish :D
Fully grown Angelfish could be OK with Oscars but I would never try it. I like my fish too much to risk them being damaged by my stupidity.
Arachnid family
Metals
Halogen
percussion
oboe
Meitnerium is a member of the transactinoids family.
Americium is a member of the actinoids family.
noble gases
Noble gases.
strings