My tank has a dirt substrate after my moss kicked the bucket. The other day while I was sitting down to feed the frogs, I noticed this tiny white creature crawling over the dirt. It was about 1mm long, and very fast and active. It was kind of translucent white, like a termite. Then one of the frogs hopped up and ate it. I saw another one in the tank yesterday. Now I'm not worried that it is a danger to the frogs, because obviously they've been in there a long time, I'm just curious what it might be?