I am happy to report that I have successfully eliminated the planaria in my yellow shrimp tank. I have only done one at this point because I wanted to make sure things went well with one tank before doing the rest. Anyways, I started off at the recommend 0.1 gram of Fenbendazole for the 10 gallon tank. I waited 48 hours--during this time, I did not feed the tank or do any maintenance/water change--and I noticed that there were still some planaria alive though they seemed to be quite immobile. I went ahead and dosed the tank again with another 0.1 gram of Fenbendazole. After an additional 48 hours, I performed a massive (80%) water change. It has been a few days and I have no seen a planaria. I can say that the Fenbendazole didn't cause any problems in the tank. I did lose 2 shrimp, but I'm hesitant to think that it was the Fenbendazole. Even if it was, I have to say that it was still worth it. It did not seem to affect the two bristlenose pleco fry that I have in the tank.
I would love to help you out and weigh out the tiny amount that you need and send it to you. Unfortunately, I'm leary of doing that. I think it would looks suspicious to be mailing a powdery substance without it being in its original packaging. I can send you a 4 gram (sealed) packet that has all the labeling on it for $7 shipped. That would leave you with needing to measure it out. I actually ordered a gram scale (accurate to 0.01 gram) on ebay for about $15 to measure mine out. If you're interested, let me know.