Hey guys well I am building a new 20gal. I drilled this tank so i could have a built in overflow and a 10 refuge in my stand below. My question is I have a little flatworm issue and want to transfer my rock from the old tank into the new. What would be the best way to go about this? I have a bunch of sand sifting stars along with pods that I don't want to kill but at the same time definitely want to get rid of these flatworms what would be the best way to go about this?