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Jay wrote thusly:

"Jason Luebke sent me his usage pattern as a reference - for 150 gallons of
tanks 1/4 t. CSM per feeding."

I have a 90 gallon tank and add about 1/10 teaspoon per day of the dry
powder directly to the tank. The iron level barely shows up on a Seachem
test kit, which is about right. I run a UV 24/7 and change 20% of the water

"Needless to say, huge difference.  Am I missing something here?"

Probably not. If all you are making is a solution of CSM+B, that's not
really PMDD, strictly speaking. Add as much as you need to get a reading of
"some" on a reliable test kit, and you will be close enough. For a better
calculation of the N and K parts of fertilizing, go to:


I experimented with the CSM+B and KNO3 until I knew how much to add for Fe
and N respectively. I think the Mullins PMDD formula underdoses K when
compared to the Gadd calculator and to most other conventional wisdom
regarding K. Who is right? Who knows, but it doesn't matter much since K can
be overdosed without apparent negative effect.

"I feel a little sheepish asking this after reading James and Karens
in the archives about folks who don't know what they are doing staying away
from this stuff.  Or something to that effect."

We have noted James' and Karens' counter-revolutionary rhetoric, and will
act accordingly when the time comes.  (Insert smiley face, big grin,
whatever else necessary to convey the joke. Sheesh.)