the picture of the toilet is from Greta's water dish I dumped in there. They are only in her cage at the moment. From the description on the link you sent they do have springtail qualities (small, bouncy & how quickly they've become a problem) except their appearance. Her water dish is cleaned multiple times a day with antibacterial soap & fresh water . She poops & pees during her daily soak outside of the cage. I do plant clover & vetch in her habitat, I think that may be part of the problem. I will clean out her entire cage & no longer plant plants directly in her area.They seem to resemble maggots, they usually go around food areas, and toilet areas, i'm not sure what they are! I'd recommend a full clean of your tortoise tank, new bedding, new substrait and disinfect the enclosure before putting your tort back in! Do you reguarly clean water and the enclosure?
But they look alittle like springtails.
Take aloook at this, see if it resembles them. http://www.orkin.com/other/springtails/