The best/hardest lesson you've learned?

[RhondaAnn]

That life is to be lived and enjoyed and to not waste time on useless emotions like anger. Being nice to others, even if a stranger, can be rewarding.

That the life you know can come to a crashing halt in a split second.

What you said above was just beautiful and SO TRUE...

 

[Jspigs]

Cycling a tank properly is important. Learned that the hard way.

 

[The Zigman]

Most important fish related thing might be to always transfer stock over a bucket.. or a 2nd container.

I learned that a full bag of fish will lose its shape, and any kind of support when it is cut open.. I dropped a whole bag of cardinal tetras on the floor once while trying to cut the bag open. Now I usually put the bag in some sort of container just in case.