Mommy Guilt

Today I experienced my first true feelings of mommy guilt. Fred the betta has passed on. Apparently I was in such a hurry to get him in his clean new bowl that I forgot to put the water treatment in his bowl too. This morning my dd is looking at his bowl and says " Mommy!! Fishy's not swimming. Fix him please." I thought he was just being stationary(as betta's usually are) but when I went over there he was a goner. I feel so bad. I called my mom and when she comes over today she is bringing a replacement Fred. I'm not ready to explain to my dd about death yet. MIL is extremely sick in the ICU right now and I just don't want to scare her or put thoughts of death into her little head.

So today I am living with some major mommy guilt. How could I have forgotten that stuff? I use it every single time we move the betta's for cleaning or whatever. I know it was only a fish but I feel like I let my girls down in some way. Surely these feelings will pass right?