These are gold, these nuggets of advice are exactly what I couldn't figure out, needing you guys speaking from experience and what works best.
Where did you get your levamisole? Is this the correct one? Levamisole-HCI-Powder
That's the expensive one, unless you have a small QT tank. This is cheaper per ounce
Amazon.com: Agrilabs Prohibit Soluble Drench Powder: Gateway
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Follow 2ppm concentration here:
Levamisole Hydrochloride — Loaches Online
Its application and usage in freshwater aquariums.