what happened to my snail?

[robertmathern]

I got home yesterday to find 1 of my snails dead. Not just dead but looks like he got eaten. I only have 1 pepermint 1 skunk cleaner shrimp. 5 blueleg hermits and I had 5 astria snals now 4. My water is good It is a new set up just finished my cycle. I did notice my amonia was .2 last night after I found him. My blueleg hermits are very tiny compared to the snail so I dont think they wanted his shell. Could it be a shrimp or did he just die and the crabs did what they do clean up the mess

 

[markeo99]

all of the above
life is short but both shrimp and hermits will find snails as an easy meal

 

[westwind77]

I am running an Eheim Wet/Dry canister filter (2229) and I was wondering how often I should open it up and clean it? Is it just a matter of flow rate dropage or is there other factors? Also, my main question is, what about the media, does that get cleaned? If so, how does that happen because I figure cleaning it will take away all the good bacteria the filter uses to keep the system stable.
Thank you!
westwind77