H202 is certainly a safer way to go for spot treating since it dissipates pretty quickly and can be redosed daily if need be.
I've had bad luck
Trio of these guys available. http://youtu.be/lpgEVKDdmJA
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Man who sleep with itchy butt wake up with stinky finger!
The fiber/charcoal filter cartridge clogs rather quickly, especially if you overfeed you fish and have excess food particles for it to filter out. It