Yep, once again, I had Endler boys jumping into a filter in search of girls. I should've known better after my last experience a few years ago. Anyhoo, I decided to throw a few boys into an Evolve 8 I've set up as a Walstad because I haven't been able to figure out what to keep in there (it's basically a toilet bowl). Well, first one guy disappeared, and I couldn't find his remains anywhere. Then the propeller clogged up, and after I cleared it, 2 more disappeared. This time, I could see 1 swimming around in the filter, but he kept hiding in the space under the filter cartridge compartment (annoying design). I had to empty the tank and then bail out the filter a 1/4 cup at a time before I was able to tilt it to one side and grab him. Now, he and the 1 guy who didn't jump are in a mixed tank. As soon as they saw those girls, they went to work, doing that silly backwards dance of theirs.