I use leeches alot to catch cats it works really well. To keep them you have to keep them cold in the frig. If the water looks dirty then it is so it must be changed if your leeches start to stink you really need to change the water and take any dead ones out. I wouldnt worry so much about feeding them but if you do then through a piece of beef liver in there and then take it out the next day because it will make the water foul. Good luck with the leeches. You can also find them on ebay. I have a link to a bait shop that sells them Pm me and I will give it to you I dont know if im allowed to post it as they are not a sponcer of the BOC.