What is the weirdest thing you have ever seen in a tank before

[Gumbies R Us]

This can be regarding livestock, equipment, or even the tank itself. I want to know what is something truly weird you have seen in someone's (or your) tank. Maybe it is an unusual species of fish, or perhaps it is a piece of equipment you have never seen used before. Let's see those WEIRD tank additions! Photo Credit: @FactoryKTMmotocross46

 

[AlyciaMarie]

In hindsight, it probably isn't "weird," but it was weird in the moment.

I remember being a small child and looking in my dad's aquarium and seeing these "alien"-like tentacles emerging from the sand bed. It freaked me out! They were slithering on the glass and sand. What freaked me out more was how freaked out my parents were! It turns out it was a brittle star that had hitch-hiked into the tank. I love brittle stars now, but as a kid—ew.

 

[Kapachuka3]

Old thread but i just saw this starfish in a tank at a store. This thing was the size of my head.

 

[FrugalReeferJon]

Years ago I saw this branching GSP for the first time in person at my LFS

 

[IndoorOcean]

I am sure I will be forever labeled a perv after I share the weirdest thing I have ever seen in an aquarium. This is 100% true and no editing or alterations have been done to the photos I have uploaded. In July of 2020, my anemone, host to my mated pair of Marron Clowns for about a year at that time, began to act very strange. Clearly it was unhappy in its current spot and I would catch it launching itself in the current and doing multiple spins while hovering at the same height for minutes before eventually landing in a different spot. However, during this activity, I came home once and found it in the most strange new shape. If this doesn't count as super weird, what does?