Hi,
Thought id put my two cents in. I bought my poweder levamisole hydrochloride at www.wormer.com. Its very expensive stuff for the amount you get. Maybe you can find somewhere cheaper. I'm going to tell you right now, these things are very hard to kill. I'm sure if you read my signature you will see I lost all of my fish except for 4. I thought these 4 were safe until just yesterday. I found another worm coming out of one of my baby female guppies. So I added a bit of my powder worming stuff and no joking, a million or more of these worms came out of hiding and were swimming around my tank. I was confused why they were white. But Wilder said its only because they havent drank blood yet, which makes alot of since. So anyways, the next morning I woke up, some of these things were still alive.
What I did is a HUGE no no and I hope nobody fusses at me. But when all of your fish have died except for 4 you kinda feel like I'LL DO ANYTHING! I put my 4 fish in a small one gallon tank that had no filter, only a little heater. Put in some meds, 4 different times. Kept checking to make sure the pH level was down of course. I let them hang out in there ALL DAY! poor things. So all day yesterday I took all my rocks, fake plants, TOSSED my Live plants (they stick to everything!) and my one decorative castle and SOAKED them in Bleach Water. I rinsed them well of course, filled up my tank again, let it run till night time. Then right before bed I added my fish back, very carefully, trying not to stir up the water. Most dead worms were at the bottom by then (because of the no filter, before they were flying around). So I slowly moved then back into the now Clean tank.
I really think i've got them clean now. I pray I do at least. This is the second go round of these things. The first time i thought I killed them, BUT BOY WAS I WRONG! So good luck to you. I pray your fish will live and you won't loose almost all of yours as I did. My husband kept telling me to flush them and start over, but were all I had left. So I just did the best I can. Once I get the pH level down in the clean tank, i plan to add more meds, just to see if I see anymore and to be on the safe side.
GOOD LUCK!