That's more like it, Chief!
We all know how keeping fish goes. It turns less than pretty on a dime, left and right and center, up and down and middle. We learn from our fishes' diseases and deaths, sad as it is, but it is true, I believe. We learn more critical knowledge and skills from hardships than from anything else taken together and multiplied by a 1,000,000.
This is true. It shall also make me feel better about what went wrong for me earlier this year making me all but give up on fishkeeping (it was nothing compared to what I've seen on here from time to time, that's for sure). We should always feel sorry for losing a fish, but your approach -learning from your mistakes and doing better the next time round- is certainly better than sulking and neglecting what you still have going for you.