Most loaches are river fish and like currents. It may have swam towards/into your filter, thinkging that it was swimming into the current and going upstream.
X2. My freshwater gobies are stream fish, and have occasionally gotten into the HOB before I moved them into the 58. It has a 2126. At $20.00 a piece, I was more than a little relieved to find them in there after thinking they didn't "work out".:icon_lol:Most loaches are river fish and like currents. It may have swam towards/into your filter, thinkging that it was swimming into the current and going upstream.