Candiru cat? That is definitely a Monster. Making me sad thinking about what it is capable of. What ever you do don't pee in the water. 
The TRUST;1987; said:I'm with BMC.
My Tank sits right at the front door. and last Halloween, we had kids knocking on the door then when I answered they went "Trick or........... HOLY COW!!!!!!!!!" then they totally forgot about the candy. LOL!
ewurm;1328515; said:This is MONSTER!
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guppy;2318; said:Wile I like big I will settle for mean, also I once had a candiru cat about four inches long that I kept in a one gallon pickle jar. In the wild they feed by vamparizing the gills of larger fish and sometimes enter the uretheras of mammals such as people. When they are in there they erect thier spines and feed on the blood. The only way to remove the is to chase then up into the bladder and then do surgery. They are native to the amazon basin. I think they qualify as monsters. In cold water tanks you can keep Pacific lampreys, they need a good water flow but eat just about any meat item and get about 3' long. They are escape artists and will latch onto you if you get careless while cleaning your tank. They should qualify not only on size but also on sheer yuck factor.