I’ve had this one for 8-10 months. But it seems to have been in hiding for quite some time now. There are 8 in there and I usually don’t see more than 6 at a time. But I will be doing a big thorough cleaning of the tank and filters here ASAP. After that I will pull this one to a qt tank and treat with metro if the hex shield doesn’t seem to gain any traction. I can also look into dimetriteazole as well.