2 mystery crabs that I never even knew that I had until I was tearing down my tank after my big crash this summer. The tank was 2 years old and had survived 3 moves and I had never even seen them. They survived the crash by crawling up my coraline covered back wall to just above the waterline.

Not a fish but I don't see my pom-pom crab or bee shrimp for 3 months or more and then one day there they will be.

I may or may not have(leaning towards not) a hectors gobie that I didnt see for six months after I added it....I was actually looking for a big arse hairy crab with a flashlight light when I caught a glimpse of it...