I hate the fact that I am never satisfied with my scape so I am always changing things around. Constant wet hands uhhhgg!
I also hate looking for the next big upgrade and not being able to find it anywhere!!!!
someone mentioned about earthquakes...(natural disasters outside of the tank) well not too long ago there was a storm here and the electricty was out all day. luckily i had a battery powered air pump. that didn't fix everything. the temp was decreasing and i lost 2 fish. my panda goby was my favorite addition.