"Dances With Ferrets" wrote in message
om...
Heya folks... anyone got any ideas for cheap sources of bioavailable
potassium for a heavily-planted 50-gallon tank, along with approximate
recommended doseage? Someone told me potassium permanganate, but I
have serious doubts about this.

I use Potash, aka Muriate of Potash or 0,0,60 fertilizer. I think it's also
sold as salt substitute and road deicer. Watch out for other additives
though. Mine came from the garden centre.

I use it in the pond at 2 tsps per 500 gallons, so my 5 lb bag should do me
a lifetime.