Murderface the fish :P
I got quite an odd scenario happening with my tank. I have 3, almost 5 year old piranhas and a rhino pleco in my 90g, I decided to throw in a bunch of guppies in hopes of making it look good, and to clean up the small bits from the piranha feeding. It is all going good, I had a couple batches of babies doing really healthy, except for when I turn off my tank light, which apparently causes all my adult guppies to disappear along with a good amount of babies. I was totally expecting to lose all the guppies, but I am very curious if anybody could shed some light on why this would be happening almost strictly at night.