I have a few to many MTS and its time to thin out the herd. These guys are good for eating any detritus that finds it way to the bottom of your tank, plus the way they move about underneath the substrate helps aerate it, which has a number of benefits including increased nutrient transference and gas exchange. Have a dwarf puffer, well here is your live food source. I will give you some for free if you come pick them up in Port Coquitlam, or I can deliver them anywhere if your willing to pay my gas money. If you want some free MTS let me know either via PM or my Cell at 604-910-6672. Thanks for taking the time to read my post.