Some bad news and some good news. This morning, I saw the red spikey worms in the oscar's anus again! So, I did another 50% water change and I treated the tank with the levamisole hydrochloride from Jeffers. The dose I used was 1 teaspoon of the liquid per 10 gallons of tank water. I did conversions, etc, until my head was spinning, and that was the lowest suggested dose I saw anywhere. (I did find a few places where people had managed to overdose a tank using pig or cow dewormer, so I was a little scared of this whole process.) I immediately saw some small worms in the water near the oscar. (Thread-like, about 0.5 cm in length.) About 1.5 hours later, there are still two spikey worms in the oscar. I don't want to increase the dose today. The oscar keeps getting pale and then coloring back up, and I'm guessing he's a little stressed out by the treatment. I'm going to wait the 72 hours and then change the water. About 5 or 6 days from today, I'll treat the tank again. I may have to use a larger dose, but I hope not!
If my math is correct, the stuff I ordered from Jeffers is 3.6%. The percent was not on the label, I calculated it, so use this number at your own risk! With the amount I used, that gave 0.00475 g/L of levamisole. The dosage Sharn suggested (0.015 g/L, again assuming I can do the math right) would be 3X the one I used, but I'm not going to increase the dosage this time around.
I just saw my oscar pass more worms. I for got to mention that I'm keeping 1 tbspn of epsom salts for every 10 gallons of water while I get this under control.
I have a stupid question. If the oscar, who evidentally is not the brightest fish in the pond, eats one of the worms he just passed, will he be reinfected? Or is the worm dead? I guess the worm is dead, but it could have eggs inside, right?
Disclaimer: If you try repeating my doses and kill your fish, please don't blame me! I'm a chemistry teacher, but not a fish expert by any means. (The 70 gallon bowfront was my Christmas present this year and marks my re-entry into the hobby.) With that said, I think the levamisole is the only thing that really worked on this parasite.
Last edited by Frances
on Sun Feb 18, 2007 2:54 pm, edited 1 time in total.