Aquariums often pretty clean, but that depends. A fish keeper would cat 3 a goldfish tank but maybe not a discus (fresh) or reef (salt). The later might even use UV sterilizer and must be clean or fish won’t live. But the Mulm on the bottom, if it cracked all the way, yeah call that a 3.
Great educational video! Would a small one time leak from a shower waste and overflow / shower valve that leaked to downstairs ceiling be considered a catagory 3?
Obviously, there are a lot of other factors we can’t be aware of on this particular project, however, generally speaking, no, this would not rise the level of a category three. This will be a category 2 loss normally.