Assuming don't have fish/corals, one way to test it is to dose pure ammonia; up to 3 ppm. You tank should be able to bring it down to zero within 24 hours.
Found a dry hermit shell under my dining table, about 15 feet from the tank, then he poked his claw out. Throw him back in and he just went his merry way. Never happened before
Found a dry hermit shell under my dining table, about 15 feet from the tank, then he poked his claw out. Throw him back in and he just went his merry way. Never happened before
It has been eye opening. A single drop with a speck of detritus has about 30-40 little guys running around.
I have stopped using filter socks. It was catching thousands of these creatures every day.