It varies, depending on the concentration of your solution. Assuming you have one that is 7.5% in concentration, then the dosage is 1ml for 7.5litres of water. Best to mix required quantity in luke warm water before pouring into into tank for medication to be effectively dissolved. Do a water change after 24 hours.
For a more detail dosage calculation, this site might help.
http://www.geocities.com/chefkeithallen/Levamisole.html
You can normally get it from bird shops along Serangoon. Alternatively, 500 ml should cost you about S$30 if you order online. Price exclude postage.
Cheers,
I have dwarf cichlids in my tanks! Do you?
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