I got a new yoyo loach a bit ago to take care of a snail problem in my 10 gallon along with a blue gourami. The snails were cleaned out in about a day, and I had a fat and happy loach. When it ran out of snails, it began trying to swim into my power filter. It was actually really funny to watch, like a salmon swimming upstream, but I was kinda worried about it. I noticed that in the bigger 55 gallon tank (where the snails were accidentally transferred from) the snails seem to colonize inside of the filter behind the pads. There was never a problem with them actually IN the tank though. Maybe it knew that they were in the filter? It has recently stopped trying, but I was just wondering if this is natural behavior?