I came home today to a big surprise!!! A big piece of poop!! After I cleaned it out I went and handled my BP.. And notice a mite on him.. I killed it and handled him some more.. nothing.. not a trace of mites.. Also look inside the tank and running my hand through the aspen still nothing.. Should I be worried? Does this have anything to do with the poop (ie Mites inside his poop)

Thanks.